Category: Machine Learning

One agent to rule them all, Deepmind’s Gato – AGI part 7

Posted on by Ray in AGI, Deep Learning, Scenario planning, Strategic Inflection Points, Strategic planning, System effectiveness

I was perusing Deepmind’s mountain of research today and ran across one article on their Gato agent (A Generalist Agent abstract, paper pdf). These days with Llama 2, GPT-4 and all the other LLM’s doing code, chatbots, image generation, etc. it seems generalist agents are everywhere. But that’s not quite right.

Gato can not only generate text from prompts, but can also control a robot arm for pick and place, caption images, navigate in 3D, play Atari and other (shooter) video games, etc. all with the same exact model architecture and the same exact NN weights with no transfer learning required.

Same weights/same model is very unusual for generalist agents. Historically, generalist agents were all specifically trained on each domain and each resultant model had distinct weights even if they used the same model architecture. For Deepmind, to train Gato and use the same model/same weights for multiple domains is a significant advance.

Gato has achieved significant success in multiple domains. See chart below. However, complete success is still a bit out of reach but they are making progress.

For instance, in the chart one can see that their are over 200 tasks in the DM Lab arena that the model is trained to perform and Gato’s mean performance for ~180 of them is above a (100%) expert level. I believe DM Lab stands for Deepmind Lab and is described as a (multiplayer, first person shooter) 3D video game built on top of Quake III arena.

Deepmind stated that the mean for each task in any domain was taken over 50 distinct iterations of the same task. Gato performs, on average, 450 out of 604 “control” tasks at better than 50% human expert level. Please note, Gato does a lot more than just “control tasks”.

Model size and RT robotic control

One thing I found interesting is that they kept the model size down to 1.2B parameters so that it can perform real time inferencing in controlling robot arms. Over time as hardware speed increases, they believe they should be able train larger models and still retain real-time control. But at the moment, with a 1.2B model it can still provide. real time inferencing.

In order to understand model size vs. expertise they used 3 different model sizes training on same data, 79M, 364M and 1.2B parameters. As can be seen on the above chart, the models did suffer in performance as they got smaller. (Unclear to me what “Tokens Processed” on the X axis actually mean other than data length trained with.) However, it seems to imply, that with similar data, bigger models performed better and the largest did 10 to 20% better than the smallest model trained with same data streams.

Examples of Gato in action

The robot they used to train for was a “Sawyer robot arm with 3-DoF cartesian velocity control, an additional DoF for velocity, and a discrete gripper action.” It seemed a very flexible robot arm that would be used in standard factory environments. One robot task was to stack different styles and colors of plastic blocks.

Deepmind says that Gato provides rudimentary dialogue generation and picture captioning capabilities. Looking at the chat streams persented, seems more than rudimentary to me.

Deepmind did try the (smaller) model on some tasks that it was not originally trained on and it seemed to perform well after “fine-tuning” on the task. In most cases, using fine-tuning of the original model, with just “same domain” (task specific) data, the finely tuned model achieved similar results to what it achieved if Gato was trained from scratch with all the data used in the original model PLUS that specific domain’s data.

Data and tokenization used to train Gato

Deepmind is known for their leading edge research in RL but Gato’s deep neural net model is all trained with supervised learning using transformer techniques. While text based transformer type learning is pervasive in LLM today, vast web class data sets on 3D shooter gaming, robotic block stacking, image captioning and others aren’t nearly as widely available. Below they list the data sets Deepmind used to train Gato.

One key to how they could train a single transformer NN model to do all this, is that they normalized ALL the different types of data above into flat arrays of tokens.

  • Text was encoded into one of 32K subwords and was represented by integers from 0 to 32K. Text is presented to the model in word order
  • Images were transformed into 16×16 pixel patches in rastor order. Each pixel is normalized -1,1.
  • Other discrete values (e.g. Atari button pushes) are flattened into sequences of integers and presented to the model in row major order.
  • Continuous values (robot arm joint torques) are 1st flattened into sequences of floats in row major order and then mu-law encoded into the range -1,1 and then discretized into one of 1024 bins.

After tokenization, the data streams are converted into embeddings. Much more information on the tokenization and embedding process used in the model is available in the paper.

One can see the token count of the training data above. Like other LLMs, transformers take a token stream and randomly zero one out and are trained to guess that correct token in sequence.

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The paper (see link above and below) has a lot more to say about the control and non-control domains and the data used in training/fine-tuning Gato, if you’re interested. They also have a lengthy section on risks and challenges present in models of this type.

My concern is that as generalist models become more pervasive and as they are trained to work in more domains, the difference between an true AGI agent and a Generalist agent starts to blur.

Something like Gato that can both work in real world (via robotics) and perform meta analysis (like in metaworld), play 1st person shooter games, and analyze 2D and 3D images, all at near expert levels, and oh, support real time inferencing, seems to not that far away from something that could be used as a killer robot in an army of the future and this is just where Gato is today.

One thing I note is that the model is not being made generally available outside of Google Deepmind. And IMHO, that for now is a good thing.

That is until some bad actor gets their hands on it….

Picture Credit(s):

All images, charts, and tables are from “A Generalist Agent” paper

MLperf results show H100 v A100 and v Habana Gaudi2 GPUs

Posted on by Ray in Cognitive computing, Deep Learning, Machine Learning, System effectiveness

MLCommons recently released new MLperf data center training results. The headlines for the relaese was that they added new GPT-3 data center training results but what I found more interesting was there was a plethora of H100 and A100 results on the same training runs which allowed me to compare the two NVIDIA GPUs in performance.

For example, in ResNet 50 (Image recognition) model training there were a number of H100 and A100 results from Dell. Two of which used the same Intel CPU counts and same H100/A100 GPU counts.

Above we show the top 10 ResNet 50 results and if you examine the #6 submission, it’s a Dell result with 4 Intel Platinum CPUs and 16 NVIDIA H100-SXM5-80GB GPUs which trained ResNet 50 model in 7.8 minutes.

What’s not on that chart is another Dell submission (#16) that also had 4 Intel Platinum CPUs but used 16 NVIDIA A100-SXM-80GB GPUs, which trained the same model in 14.4 minutes.

For ResNet 50 then the H100 is 1.8X faster than a similarly configured A100.

We show above results for Image Segmentation model training top 10. In this case there were two similar Dell submissions, at #3 and #4, in the top 10. These had similar hardware configuration but used H100 or A100 GPUs

These Dell two Image Segmentation (3D-Unet) model training result submissions of 7.6 minutes and 11.0 minutes, respectively means that for Image Segmentation, the H100 is 1.4X faster than the A100.

Finally, for DLRM Recommendation engine training results, there were two other Dell submissions (#5 & #7) that used 2 Intel Platinum CPUs and 8 (H100-SXM5-80GB and A100-SXM-80GB) GPUs and trained in 4.3 and 8.4 minutes, respectively. This says for the DLRM model training the H100 is 2.0X faster than the A100 for DLRM model tracing.

There were other comparisons (that didn’t attain top training results) with with 2 Intel Platinum CPUs and 8 (H100 and A100) GPUs for other model results, which show the H100 is anywhere from 1.7X faster to 2.1X faster.

Unclear why the H100 GPUs perform relatively better with fewer GPUs in the configuration but there may be some additional overhead involved in supporting more CPUs and GPUs which reduces their relative performance.

As a result, we can report from recent MLperf data center training results show for 4 CPUs and 16 (H100 or A100) GPUs the H100 performed 1.4X to 1.8X faster than the A100 and for 2 CPUs and 8 (H100 & A100) GPUs the H100 performed 1.7X two 2.1X faster than the A100.

There was one other interesting GPU comparison shown in recent MLperf results, that between the NVIDIA H100-SXM5-80GB and the Intel Habana Gaudi2 GPU. In this case the submissions involved different vendors (Dell and Intel) and different AI frameworks NGC MXNet 23.04, NGC Pytorch 23.04, NGC HugeCTR 23.04 for the H100 and PyTorch 1.13.1a0 for the Habana Gaudi2. For both submissions they used 2 Intel Platinum CPUs and 8 (H100 or Habana Gaudi1) GPUs.

Again, none of these (H100 vs Habana Guidi2 GPU) results appear in the top result charts we show here.

For ResNet 50 The H100 GPU trained ResNet 50 ins 13.5 min and the Habana Gaudii2 GPU trained ResNet 50 in 16.5 min. This would say the H100 is 1.2X faster than the Habana Guidi2 GPU.

In addition, both of these submissions also trained against the image segmentation model. The H100 trained the image segmentation model in 12.2 minutes while the Habana Guidi2 trained in 20.5 minutes. This would say that the H100 is 1.7X faster than the Habana Gaudi2 GPU.

As a result, recent MLperf data center training results show the NVIDIA H100-SXM5-80GB is 1.2 to 1.7X faster than the Intel Habana Guadi2 GPU on the 2 different model training esults with similar hardware configurations

Finally, MLperf results for GPT-3 are brand new for this release, so we present them below.

There were only 4 (on prem) submissions for GPT-3 in this round. And the #1 NVIDIA with 192 CPUs and 768 H100-SXM5-80GB GPUS trained in 44.8 minutes while the #4 Intel submission with 64 CPUs and 256 Habana Gaudi2 GPUs trained in 442.6 min, respectively.

It’s less certain whether we should compare GPU speeds here as 1) the comparison (#1 to #3 and #2 to #4) used 1/2 the hardware and 2) the software frameworks were very dissimilar, the (#1 & #2) NVIDIA H100 GPT-3 submissions used the NVIDIA NeMo software framework and the Intel (#3 AND #4) submissions used PyTorch 1.13.1a0. Not sure what NVIDIA NeMo is derived from but it doesn’t seem to be being used in any other model training run for MLperf other than GPT-3.

Comments?

Deepmind does sort

Posted on by Ray in Cognitive computing, Deep Learning, Reinforcement Learning, Strategic Inflection Points, System effectiveness, Visionary leadershp, Visionary organizations

Saw an article today on TNW on DeepMind’s new AI taps games to enhance fundamental algorithms which was discussing a recent Nature paper Faster sorting algorithms discovered using deep reinforcement learning and website, which described AlphaDev.

Google DeepMind’s AlphaDev is a derivative of AlphaZero (follow on from AlphaMu and AlphaGo, the conquerer of Go and other strategy games). AlphaDev uses Deep Reinforcement Learning (DRL) to come up with new computer science algorithms. In the first incarnation, a way to sort (2,3,4 or 5 integers) using X86 instructions.

Sorting has been well explored over the years in computer science (CS, e.g. see Donald E. Knuth’s Volume 3 in The Art of Computer Programming, Sorting and Searching), so when a new more efficient/faster sort algorithm comes out it’s a big deal. Google used to ask job applicants how they would code sort algorithms for specific problems. Successful candidates would intrinsically know all the basic CS sorting algorithms and which one would work best in different circumstances.

Deepmind’s approach to sort

Reading the TNW news article, I couldn’t conceive of the action space involved in the reinforcement learning let alone what the state space would look like. However, as I read the Nature article, DeepMind researchers did a decent job of explaining their DRL approach to developing new basic CS algorithms like sorting.

AlphaDev uses a transformer-like framework and a very limited set of x86 (sort of, encapsulated) instructions with memory/register files and limited it to sorting 2, 3, 4, or 5 integer. Such functionality is at the heart of any sort algorithm and as such, is used a gazillion times over and over again in any sorting task involving a long string of items. I think Alphadev used a form of on-policy RL but can’t be sure.

Looking at the X86 basic instruction cheat sheet, there’s over 30 basic forms for X86 instructions which are then multiplied by type of data (registers, memory, constants, etc. and length of operands) being manipulated.

AlphaDev only used 4 (ok, 9 if you include the conditionals for conditional move and conditional jump) X86 instructions. The instructions were mov<A,B>, cmovX<A,B>, cmp<A,B> and jX<A,B> (where X identify the condition under which a conditional move [cmovX] or jump [jX] would take place). And they only used (full, 64 bit) integers in registers and memory locations.

AlphaDev actions

The types of actions that AlphaDev could take included the following:

  • Add transformation – which added an instruction to the end of the current program
  • Swap transformation – which swapped two instructions in the current program
  • Opcode transformation – which changed the opcode (e.g., instruction such as mov to cmp) of a step in the current program
  • Operand transformation – which changed the operand(s) for an instruction in the current program
  • Instruction transformation – which changed the opcode and operand(s) for some instruction in the current program.

They list in their paper a correctness cost function which at each transformation provides value function (I think) for the RL policy. They experimented with 3 different functions which were: 1) the %correctly placed items; 2) square_root(%correctly placed); and 3)the square_root(number of items – number correctly placed). They discovered that the last worked best.

They also placed some constraints on the code generated (called action pruning rules):

  • Memory locations are always read in incremental order
  • Registers are allocated in incremental order
  • Program cannot compare or conditionally move to memory location
  • Program can only read and write to each memory location once (it seems this would tell the RL algorithm when to end the program)
  • Program can not perform two consecutive compare instructions

AlphaDev states

How they determined the state of the program during each transformation was also different. They used one hot encodings (essentially a bit in a bit map is assigned to every instruction-operand pair) for opcode-operand steps in the current program and appended each encoded step into a single program string. Ditto for the state of the memory and registers (at each instruction presumably?). Both the instruction list and memory-register embeddings thenn fed into a state representation encoder.

This state “representation network” (DNN) generated a “latent representation of the State(t)” (maybe it classified the state into one of N classes). For each latent state (classification), there is another “prediction network” (DNN) that predicts the expected return value (presumably trained on correctness cost function above) for each state action. And between the state and expected return values AlphaDev created a (RL) policy to select the next action to perform.

Presumably they started with current basic CS sort algorithms, and 2-5 random integers in memory and fed this (properly encoded and embedded) in as a starting point. Then the AlphaDev algorithm went to work to improve it.

Do this enough times, with an intelligent approach between exploration (more randomly at first) and policy following (more use of policy later) selection of actions and you too can generate new sorting algorithms.

DeepMind also spent time creating a stochastic solution to sorting that they used to compare agains their AlphaDev DRL approach to see which did better. In the end they found the AlphaDev DRL approach worked faster and better than the stochastic solutions they tried.

DeepMind having conquered sorting did the same for hashing.

Why I think DeepMind’s AlphaDev is better

AlphaDev’s approach could just as easily be applied to any of Donald E. Knuth’s, 4 volume series on The Art of Computer Programming book algorithms.

I believe DeepMind’s approach is much more valuable to programmers (and humanity) than CoPilot, ChatGPT code, AlphaCode (DeepMind’s other code generator) or any other code generation transformers.

IMHO AlphaDev goes to the essence of computer science as it’s been practiced over the last 70 years. Here’s what we know and now let’s try to discover a better way do the work we all have to do. Once, we have discovered a new and better way, report and document them as widely as possible so that any programmers can stand on our shoulders, use our work to do what they need to get done.

If I’m going to apply AI to coding, having it generate better basic CS algorithms is much more fruitful for the programming industry (and I may add, humanity as a whole) than having it generate yet another IOS app code or web site from scratch.

Comments?

Picture Credit(s):

The problem with Robotic AI is … data

Posted on by Ray in Cognitive computing, Data, Machine Learning, Reinforcement Learning, Robots, Strategic Inflection Points

The advances made in textual and visual (and now aural) AI have been mind blowing in recent years. But most of this has been brought about via the massive availability of of textual, visual and audio data AND the advancement in hardware acceleration.

Robotics can take readily take advantage of hardware improvements but finding the robotic data needed to train robotic AI is a serious challenge.

Yes simulation environments can help but fidelity (how close simulation is to reality) is always a concern.

To gather the amounts of data needed to train a simple robotic manipulator to grab a screw from a bin is huge problem. In the past the only way to do this was, to create your robot, and have it start to do random screw type grab motions and monitor hat happens. After about a 1000 or 10K of these grabs, the robot would stop working because, gears wear down, grippers come loose, motors less responsive, images get obscured, etc. For robots it’s not as simple as scraping the web for images or downloading all the (english) text in wikipedia and masking select words to generate pseudo supervised learning. .

There’s just no way to do that in robotics without deploying 100s or 1000s or 10,000s of real physical robots (or cars) all instrumented with everything needed to capture data for AI learning in real time and let these devices go out on the world with humans guiding them.

While this might work for properly instrumented fleet of cars that are already useful in their own rights even without automation and humans are more than happy to guide them out on the road. This doesn’t work for other robots, whose usefulness can only be realized after they are AI trained, not before.

Fast-RLAP (RC) car driving learning machine

So I was very interested to see a tweet on FastRLAP (paper: FastRLAP: A System for Learning High-Speed Driving via Deep RL and Autonomous Practicing) which used deep reinforcement learning plus a human guided lap plus autonomous driving to teach an AI model how to drive a small RC model car with a vision system, IMUs and GPS to steer around a house, a racetrack and an office environment.

Ok,I know it still involves taking an instrumented robot and have it actually move around the real world. But, Fast-RLAP accelerates AI learning significantly. Rather than having to take 1000 or 10,000 random laps around a house, it was able to learn how to drive around the course to an expert level very rapidly

They used Fast-RLAP to create a policy that enabled the RC car to drive around 3 indoor circuits, two outdoor circuits and one simulated circuit and in most cases, achieving expert level track times, in typically under 40 minutes.

On the indoor course, vinyl floor, the car learned how to perform drift turns (not sure I know how to do do drift turns). On tight “S” curves, the car learned how to get as close to the proper racing line as possible (something I achieved, rarely, only on motorcycles a long time ago). And all while managing to avoid collisions

The approach seems to be have a human drive the model car slowly around the course, flagging or identifying intermediate way points or checkpoints on the track. During driving the loop, the car would use the direction to the next way point as guidance to where to drive next.

Note the light blue circles are example tracks waypoints, they differ in size and location around each track.

The approach seems to make use of a pre-trained track following DNN, but they stripped the driving dynamics (output layers) and just kept the vision (image) encoder portion to provide a means to encode an image and identify route relevant features (which future routes led to collisions, which routes were of interest to get to your next checkpoint, etc).

I believe they used this pre-trained DNN to supply a set of actions to the RL policy which would select between them to take RC car actions (wheel motor/brake settings, steering settings, etc.) and generate the next RC car state (location, direction to next waypoint, etc.).

They used an initial human guided lap, mentioned above to id way points and possibly to supply data for the first RL policy.

The RL part of the algorithm used off-policy RL learning (the RC car would upload lap data at waypoints to a server, which would periodically go through, select lap states and actions at random and update its RL policy, which would then be downloaded to the RC car in motion, (code: GitHub repo).

The reward function used to drive RL was based on minimizing the time to next way point, collision counts, and stuck counts.

I assume collision counts were instances where the car struck some obstacle but could continue on towards the next way point. Stuck instances were when the car could no longer move in the direction its RL policy told it. The system had a finite state machine that allowed it to get out of stuck points by reversing wheel motor(s) and choosing a random direction for steering.

You can see the effects of the pre-trained vision system in some of the screen shots of what the car was trying to do.

In any case, this is the sort of thinking that needs to go on in robotics in order to create more AI capable robots. That is, not unlike transformer learning, we need to figure out a way to take what’s already available in our world and use it to help generate the real world data needed to train robotic DNN/RL algorithms to do what needs to be done.

Comments?

Picture credits:

AWS Data Exchange vs Data Banks – part 2

Posted on by Ray in Artificial Intelligence, Cloud services, Cognitive computing, Data, data access, Data banks, Data economy, Data ownership, Data withdrawals, Deep Learning, Information economy, Initial Data Offerings (IDOs), Machine Learning, Neural network, Strategic Inflection Points

Saw where AWS announced a new Data Exchange service on their AWS Pi day 2023. This is a completely managed service available on the AWS market place to monetize data.

In a prior post on a topic I called data banks (Data banks, data deposits & data withdrawals…), I talked about the need to have some sort of automated support for personal data that would allow us to monetize it.

The hope then (4.5yrs ago) was that social media, search and other web services would supply all the data they have on us back to us and we could then sell it to others that wanted to use it.

In that post, I called the data the social media gave back to us data deposits, the place where that data was held and sold a data bank, and the sale of that data a data withdrawal. (I know talking about banks deposits and withdrawals is probably not a great idea right now but this was back a ways).

AWS Data Exchange

1918 Farm Auction by dok1 (cc) (from Flickr)
1918 Farm Auction by dok1 (cc) (from Flickr)

With AWS Data Exchange, data owners can sell their data to data consumers. And it’s a completely AWS managed service. One presumably creates an S3 bucket with the data you want to sell. determine a price to sell the data for and a period clients can access that data for and register this with AWS and the AWS Data Exchange will support any number of clients purchasing data data.

Presumably, (although unstated in the service announcement), you’d be required to update and curate the data to insure it’s correct and current but other than that once the data is on S3 and the offer is in place you could just sit back and take the cash coming in.

I see the AWS Data Exchange service as a step on the path of data monetization for anyone. Yes it’s got to be on S3, and yes it’s via AWS marketplace, which means that AWS gets a cut off any sale, but it’s certainly a step towards a more free-er data marketplace.

Changes I would like to AWS Data Exchange service

Putting aside the need to have more than just AWS offer such a service, and I heartedly request that all cloud service providers make a data exchange or something similar as a fully supported offering of their respective storage services. This is not quite the complete data economy or ecosystem that I had envisioned in September of 2018.

If we just focus on the use (data withdrawal) side of a data economy, which is the main thing AWS data exchange seems to supports, there’s quite a few missing features IMHO,

  • Data use restrictions – We don’t want customers to obtain a copy of our data. We would very much like to restrict them to reading it and having plain text access to the data only during the period they have paid to access it. Once that period expires all copies of data needs to be destroyed programmatically, cryptographically or in some other permanent/verifiable fashion. This can’t be done through just license restrictions. Which seems to be the AWS Data Exchanges current approach. Not sure what a viable alternative might be but some sort of time-dependent or temporal encryption key that could be expired would be one step but customers would need to install some sort of data exchange service on their servers using the data that would support encryption access/use.
  • Data traceability – Yes, clients who purchase access should have access to the data for whatever they want to use it for. But there should be some way to trace where our data ended up or was used for. If it’s to help train a NN, then I would like to see some sort of provenance or certificate applied to that NN, in a standardized structure, to indicate that it made use of our data as part of its training. Similarly, if it’s part of an online display tool somewhere in the footnotes of the UI would be a data origins certificate list which would have some way to point back to our data as the source of the information presented. Ditto for any application that made use of the data. AWS Data Exchange does nothing to support this. In reality something like this would need standards bodies to create certificates and additional structures for NN, standard application packages, online services etc. that would retain and provide proof of data origins via certificates.
  • Data locality – there are some juristictions around the world which restrict where data generated within their boundaries can be sent, processed or used. I take it that AWS Data Exchange deals with these restrictions by either not offering data under jurisdictional restrictions for sale outside governmental boundaries or gating purchase of the data outside valid jurisdictions. But given VPNs and similar services, this seems to be less effective. If there’s some sort of temporal key encryption service to make use of our data then its would seem reasonable to add some sort of regional key encryption addition to it.
  • Data audibility – there needs to be some way to insure that our data is not used outside the organizations that have actually paid for it. And that if there’s some sort of data certificate saying that the application or service that used the data has access to that data, that this mechanism is mandated to be used, supported, and validated. In reality, something like this would need a whole re-thinking of how data is used in society. Financial auditing took centuries to take hold and become an effective (sometimes?) tool to monitor against financial abuse. Data auditing would need many of the same sorts of functionality, i.e. Certified Data Auditors, Data Accounting Standards Board (DASB) which defines standardized reports as to how an entity is supposed to track and report on data usage, governmental regulations which requires public (and private?) companies to report on the origins of the data they use on a yearly/quarterly basis, etc.

Probably much more that could be added here but this should suffice for now.

other changes to AWS Data Exchange processes

The AWS Pi Day 2023 announcement didn’t really describe the supplier end of how the service works. How one registers a bucket for sale was not described. I’d certainly want some sort of stenography service to tag the data being sold with the identity of those who purchased it. That way there might be some possibility to tracking who released any data exchange data into the wild.

Also, how the data exchange data access is billed for seems a bit archaic. As far as I can determine one gets unlimited access to data for some defined period (N months) for some specific amount ($s). And once that period expires, customers have to pay up or cease accessing the S3 data. I’d prefer to see at least a GB/month sort of cost structure that way if a customer copies all the data they pay for that privilege and if they want to reread the data multiple times they get to pay for that data access. Presumably this would require some sort of solution to the data use restrictions above to enforce.

Data banks, deposits, withdrawals and Initial Data Offerings (IDOs)

The earlier post talks about an expanded data ecosystem or economy. And I won’t revisit all that here but one thing that I believe may be worth re-examining is Initial Data Offerings or IDOs.

As described in the earlier post, IDO’ss was a mechanism for data users to request permanent access to our data but in exchange instead of supplying it for a one time fee, they would offer data equity in the service.

Not unlike VC, each data provider would be supplied some % (data?) ownership in the service and over time data ownership get’s diluted at further data raises but at some point when the service is profitable, data ownership units could be purchased outright, so that the service could exit it’s private data use stage and go public (data use).

Yeah, this all sounds complex, and AWS Data Exchange just sells data once and you have access to it for some period, establishing data usage rights.. But I think that in order to compensate users for their data there needs to be something like IDOs that provides data ownership shares in some service that can be transferred (sold) to others.

I didn’t flesh any of that out in the original post but I still think it’s the only way to truly compensate individuals (and corporations) for the (free) use of the data that web, AI and other systems are using to create their services.

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I wrote the older post in 2018 because I saw the potential for our data to be used by others to create/trlain services that generate lots of money for those organization but without any of our knowledge, outright consent and without compensating us for the data we have (indadvertenly or advertently) created over our life span.

As an example One can see how Getty Images is suing DALL-E 2 and others have had free use of their copyrighted materials to train their AI NN. If one looks underneath the covers of ChatGPT, many image processing/facial recognition services, and many other NN, much of the data used in training them was obtained by scrapping web pages that weren’t originally intended to supply this sorts of data to others.

For example, it wouldn’t surprise me to find out that RayOnStorage posts text has been scrapped from the web and used to train some large language model like ChatGPT.

Do I receive any payment or ownership equity in any of these services – NO. I write these blog posts partially as a means of marketing my other consulting services but also because I have an abiding interest in the subject under discussion. I’m happy for humanity to read these and welcome comments on them by humans. But I’m not happy to have llm or other RNs use my text to train their models.

On the other hand, I’d gladly sell access to RayOnStorage posts text if they offered me a high but fair price for their use of it for some time period say one year… 🙂

Comments?

LLM exhibits Theory of Mind

Posted on by Ray in Artificial Intelligence, Cognitive computing, Machine Learning, R&D measures, Strategic Inflection Points, Uncategorized

Ran across an interesting article today (thank you John Grant/MLOps.community slack channel), titled Theory of Mind may have spontaneously emerged in Large Language Models, by M. Kosinski from Stanford. The researcher tested various large language models (LLMs) on psychological tests to determine the level of theory of mind (ToM) the models had achieved.

Earlier versions of OpenAI’s GPT-3 (GPT-1, -2 and original -3) showed almost no ToM capabilities but the latest version, GPT-3.5 does show ToM equivalent to 8 to 9 year olds.

Theory of Mind

According to Wikipedia (Theory Of Mind article), ToM is “…the capacity to understand other people by ascribing mental states to them (that is, surmising what is happening in their mind).” This seems to be one way people use to understand one another.

For instance, If I can somehow guess what you are thinking about a topic, situation, or event I can hopefully communicate with you better than if I can’t. At least that’s the psychological perspective.

The belief is that people with Aspergers, ADHD, schizophrenia, and other afflictions all show ToM deficits when compared to normal people. As a result, over time, psychologists have developed tests for people to measure their ToM.

These tests typically involve putting 2 people in a situation with props and other indicators used to tell what a person is thinking and asking them what they think the other person is thinking. They grade a persons ToM based on expected results.

ToM and LLM

The researcher took these tests, with people, props and situations and converted them to textual sentences and prompts that mimicked situations tested in ToM testing. So they created a textual story or pretext and a set of text prompts about the situation which the LLM was to complete.

For example, one pretext or story is the following:

“Here is a bag filled with popcorn. There is no chocolate in the bag. Yet, the label on the bag says ‘chocolate’ and not ‘popcorn.’ Sam finds the bag. She had never seen the bag before. She cannot see what is inside the bag. She reads the label.”

This is fed into the LLM and then a prompt is provided, such as:

“She opens the bag and looks inside. She can clearly see that it is full of _________“

If the LLM has ToM and based on the pretext and prompt, it will say “popcorn” but the LLM also provides a follow on sentence or two which describes the situation as the LLM understands it:

“popcorn. Sam is confused. She wonders why the label says “chocolate” when the bag is clearly filled with popcorn. She looks around to see if there is any other information about the bag. She finds nothing. She decides to take the bag to the store where she bought it and ask for an explanation.“

The text in BOLD is generated by a ToM capable LLM. The researcher also showed the probability assigned by the LLM to that first word of the prompt. In the case above, it showed [Ppopcorn = 100%; Pchocolate = 0%].

The also use different prompts with the same story to see if the LLM truly shows ToM. For instance something like, “She believes the bag is full of ___________” and “She’s delighted finding the bag, she loves eating _______”. This provides a sort of test of comprehension of the situation by the LLM.

The researcher controlled for word frequency using reversals of the key words in the story, i.e., the bag has chocolate but says popcorn. They also generated scrambled versions of the story where they replaced the first set of chocolate and popcorn with either at random. They considered this the scrambled case. The reset the model between each case. In the paper they show the success rate for the LLMs for 10,000 scrambled versions, some of which were correct.

They labeled the above series of tests as “Unexpected content tasks“. But they also included another type of ToM test which they labeled “Unexpected transfer tasks“.

Unexpected transfer tasks involved a story like where person A saw another person B put a pet in a basket, that person left and the person A moved the pet. And prompted the LLM to see if it understood where the pet was and how person B would react when they got back.

In the end, after trying to statistically control, as much as possible, with the story and prompts, the researchers ended up creating 20 unique stories and presented the prompts to the LLM.

Results of their ToM testing on a select set of LLMs look like:

As can be seen from the graphic, the latest version of GPT-3.5 (davinci-003 with 176B* parameters) achieved something like an 8yr old in Unexpected Contents Tasks and a 9yr old on Unexpected Transfer Tasks.

The researchers showed other charts that tracked LLM probabilities on (for example in the first story above) bag contents and Sam’s belief. They measured this for every sentence of the story.

Not sure why this is important but it does show how the LLM interprets the story. Unclear how they got these internal probabilities but maybe they used the prompts at various points in the story.

The paper shows that according to their testing, GPT-3.5 davinci-003 clearly provides a level of ToM of an 8-9yr old on ToM tasks they have translated into text.

The paper says they created 20 stories and 6 prompts which they reversed and scrambled. But 20 tales seems less than statistically significant even with reversals and randomization. And yet, there’s clearly a growing level of ToM in the models as they get more sophisticated or change over time.

Psychology has come up with many tests to ascertain whether a person is “normal or not’. Wikipedia (Psychological testing article) lists over 13 classes of psychological tests which include intelligence, personality, aptitude, etc.

Now that LLM seem to have mastered textual input and output generation. It would be worthwhile to translate all psychological tests into text and trying them out on all LLMs to track where they are today using these tests and where they have trended over time.

I could see at some point using something akin to multiple psychological test scores as a way to grade LLMs over time.

So today’s GPT3.5 has a ToM of an 8-9yr old. Be very interesting to see what GPT-4 does on similar testing.

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Data and code versioning For MLops

Posted on by Ray in Artificial Intelligence, Data, Data ownership, Data versioning, Machine Learning, MLOps, Object storage

Read an interesting article (Ex-Apple engineers raise … data storage startup) and research paper (Git is for data) about a of group of ML engineers from Apple forming a new “data storage” startup targeted at MLOps teams just like Apple. It turns out that MLops has some very unique data requirements that go way beyond just data storage.

The paper discusses some of the unusual data requirements for MLOps such as:

  • Infrequent updates – yes there are some MLOps datasets where updates are streamed in but the vast majority of MLOps datasets are updated on a slower cadence. The authors think monthly works for most MLOps teams
  • Small changes/lots of copies – The changes to MLOps data are relatively small compared to the overall dataset size and usually consist of data additions, record deletions, label updates, etc. But uncommon to most data, MLOps data are often subsetted or extracted into smaller datasets used for testing, experimentation and other “off-label” activities.
  • Variety of file types – depending on the application domain, MLOps file types range all over the place. But there’s often a lot of CSV files in combination with text, images, audio, and semi-structured data (DICOM, FASTQ, sensor streams, etc.). However within a single domain, MLOps file types are pretty much all the same.
  • Variety of file directory trees – this is very MLOps team and model dependent. Usually there are train/validate/test splits to every MLOps dataset but what’s underneath each of these can vary a lot and needs to be user customizable.
  • Data often requires pre-processing to be cleansed and made into something appropriate and more useable by ML models
  • Code and data must co-evolve together, over time – as data changes, the code that uses them change. Adding more data may not cause changes to code but models are constantly under scrutiny to improve performance, accuracy or remove biases. Bias elimination often requires data changes but code changes may also be needed.

It’s that last requirement, MLOps data and code must co-evolve and thus, need to be versioned together that’s most unusual. Data-code co-evolution is needed for reproducibility, rollback and QA but also for many other reasons as well.

In the paper they show a typical MLOps data pipeline.

Versioning can also provide data (and code) provenance, identifying the origin of data (and code). MLOps teams undergoing continuous integration need to know where data and code came from and who changed them. And as most MLOps teams collaborate in the development, they also need a way to identify data and code conflicts when multiple changes occur to the same artifact.

Source version control

Code has had this versioning problem forever and the solution became revision control systems (RCS) or source version control (SVC) systems. The most popular solutions for code RCS are Git (software) and GitHub (SaaS). Both provide repositories and source code version control (clone, checkout, diff, add/merge, commit, etc.) as well as a number of other features that enable teams of developers to collaborate on code development.

The only thing holding Git/GitHub back from being the answer to MLOps data and code version control is that they don’t handle large (>1MB) files very well.

The solution seems to be adding better data handling capabilities to Git or GitHub. And that’s what XetHub has created for Git.

XetHub’s “Git is Data” paper (see link above) explains what they do in much detail, as to how they provide a better data layer to Git, but it boils down to using Git for code versioning and as a metadata database for their deduplicating data store. They are using a Merkle trees to track the chunks of data in a deduped dataset.

How XetHub works

XetHub support (dedupe) variable chunking capabilities for their data store. This allows them to use relatively small files checked into Git to provide the metadata to point to the current (and all) previous versions of data files checked into the system.

Their mean chunk size is ~4KB. Data chunks are stored in their data store. But the manifest for dataset versions is effectively stored in the Git repository.

The paper shows how using a deduplicated data store can support data versioning.

XetHub uses a content addressable store (CAS) to store the file data chunk(s) as objects or BLOBs. The key to getting good IO performance out of such a system is to have small chunks but large objects.

They map data chunks to files using a CDMT (content defined merkle tree[s]). Each chunk of data resides in at least two different CDMTs, one associated with the file version and the other associated with the data storage elements.

XetHub’s variable chunking approach is done using a statistical approach and multiple checksums but they also offer one specialized file type chunking for CSV files. As it is, even with their general purpose variable chunking method, they can offer ~9X dedupe ratio for text data (embeddings).

They end up using Git commands for code and data but provide hooks (Git filters) to support data cloning, add/checkin, commits, etc.). So they can take advantage of all the capabilities of Git that have grown up over the years to support code collaborative development but use these for data as well as code.

In addition to normal Git services for code and data, XetHub also offers a read-only, NFSv3 file system interface to XetHub datases. Doing this eliminates having to reconstitute and copy TB of data from their code-data repo to user workstations. With NFSv3 front end access to XetHub data, users can easily incorporate data access for experimentation, testing and other uses.

Results from using XetHub

XetHub showed some benchmarks comparing their solution to GIT LFS, another Git based large data storage solution. For their benchmark, they used the CORD-19 (and ArXiv paper, and Kaggle CORD-I9 dataset) which is a corpus of all COVID-19 papers since COVID started. The corpus is updated daily, released periodically and they used the last 50 versions (up to June 2022) of the research corpus for their benchmark.

Each version of the CORD-19 corpus consists of JSON files (research reports, up to 700K each) and 2 large CSV files one with paper information and the other paper (word?) embeddings (a more useable version of the paper text/tables used for ML modeling).

For CORD-19, XetHub are able to store all the 2.45TB of research reports and CSV files in only 287GB of Git (metadata) and datastore data, or with a dedupe factor 8.7X. With XetHub’s specialized CSV chunking (Xet w/ CSV chunking above), the CORD-19 50 versions can be stored in 87GB or with a 28.8X dedupe ratio. And of that 87GB, only 82GB is data and the rest ~5GB is metadata (of which 1.7GB is the merle tree).

In the paper, they also showed the cost of branching this data by extracting and adding one version which consisted of a 75-25% (random) split of a version. This split was accomplished by changing only the two (paper metadata and paper word embeddings) CSV files. Adding this single split version to their code-data repository/datastore only took an additional 11GB of space An aligned split (only partitioning on a CSV record boundary, unclear but presumably with CSV chunking), only added 185KB.

XETHUB Potential Enhancements

XetHub envisions many enhancements to their solution, including adding other specific file type chunking strategies, adding a “time series” view to their NFS frontend to view code/data versions over time, finer granularity data provenance (at the record level rather than at the change level), and RW NFS access to data. Further, XetHub’s dedupe metadata (on the Git repo) only grows over time, supporting updates and deletes to dedupe metadata would help reduce data requirements.

Read the paper to find out more.

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Deepmind does chat

Posted on by Ray in Artificial Intelligence, Deep Learning, Machine Learning, Reinforcement Learning

Read an article this week on Deepmind’s latest research into developing a chat agent (Improving alignment of dialogue agents via targeted human judgements). Lot’s of interesting approaches have been applied to chat but even today, most chat model’s are rife with problems, that include being bigoted, profane, incorrect, etc.

Reinforcement learning vs. deep neural networks in Sparrow Chat

Deepmind specializes in the use of Reinforcement Learning (RL) as applied to master Atari, chess and go games but they have also been known to use dNN’s (deep neural networks) for their AlphaFold and other models. Indeed, Atari and the other game playing work that Deepmind has released has been a hybrid which included a dNNs as well as RL models.

Deepmind’s version of chat is currently called Sparrow and it uses models trained with the help of RL with human feedback (RLHF). RLs are used to create policy models which select actions to be taken in a specific state.

In Sparrow’s case, state is given by the most recent chat input plus the context (prior chat input and replies) of the dialogue up to this time and actions (our guess) is the set of possible replies to that input.

Sparrow is able to generate replies that are 82% mostly true or true and are 69% trustworthy or very trustworthy as rated by the authors of the model. Deepmind’s DPC (Dialogue Prompted Chinchilla, which is Deepmind’s current competitor to GPT-3 NLP transformer) model only managed 63% and 54%, respectively for the same metrics

It should be noted that human feedback was only used to train the two Preference RMs and the one Rule RM. In combination, these RMs provide the reward signal to train the Sparrow RL policy model which drives its chat responses.

Sparrow’s 5 models are built onto of DPC. And the 5 models use a portion of DPC which is frozen (layers not being trained) and a portion which is specifically trained for each of the 5 models (learning enabled layers. The end (output) layers are on top, input layers are after the embedding layer(s). Note, the value function is not a model and is just a calculation based on the RMs used to generate the reward signal for Sparrow’s policy model training.

Rules for Sparrow chats

Notably, Deepmind’s Sparrow model has a separate model specifically trained to determine if a particular chat response is breaking a rule. Deepmind identified 23 rules which their chat model is trained not to break.

Some of these rules include don’t provide financial advice, don’t provide medical advice, don’t pretend it is a human, etc.

In the above chart the RL@8 is the fully trained (if it can ever be considered fully trained) Sparrow chat model. One can see that Sparrow rated against DPC, both using (Google) search or not. For most rules, Sparrow is considerably better than DPC alone.

Another thing that Deepmind did which was interesting was that in training the Rule RM they used adversarial attacks (red teaming) to see if they could cause Sparrow to violate specific rules.

Preference ranking

Deepmind also created (two) Preference RMs (reward models). Sparrow generates a series of (2 or 8) responses for every chat query and the Preference RMs (and Rule RM) are used to select which one is actually sent back to the user. Human feedback was used to train the two Preference RMs

Two Preference RMs were found to perform better than a single Preference RM. The two Preference RMs were trained as follows:

  • One was trained on all Sparrow replies (with and without [Google] search results)
  • One was trained on Sparrow replies without search results.

Sparrow uses search results to provide evidence for some replies. It turns out that some chat questions are fact based questions and for these Sparrow actually uses search results to generate evidence for its chat replies. Sparrow automatically generates search requests and scrapes replies using 500 characters surrounding the snippet returned from the search.

Sparrow uses a re-ranking approach to selecting a response to a chat query. In this case, Sparrow generates a list of responses, 2 (RL@2) or 8 (called RL@8) and then using the two Preference RMs and the single Rule RM ranks them to see which is best and uses the best to reply to the chat user.

Sparrow actually generates two replies for every search query (Google Search API call), probably selecting two top search responses (we guess). So in the RL@8 version of Sparrow these 8 replies are submitted to the two Preference RMs and the Rule RM and are ranked accordion to which is best and then the best one is used to reply to the query.

In the above chart, higher shows that the ranking preference of the various models vs. human preferences and to the right indicates less rule breaking responses. We assume this is with RL@8 Sparrow models. One can see that taking into consideration rule breaking (not violating rules) reduces the preference rankings of Sparrow’s replies. But we would prefer to have no rule breaking so the Sparrow that has both Preference RMs and Rule RM (trained with adversarial training) shows the least amount of rule breaking (~7%) with an almost 70% ranking vs human preferences. The error bars on the points in the chart above show 68% interval around the model responses.

Sparrow in action

It’s somewhat intriguing that Deepmind (with all of Google’s resources) tried to optimize Sparrow for both computation and memory considerations. Almost like they were planning on releasing it on an IoT or phone device.

There’s plenty more to say about what Deepmind has done with Sparrow. The report cited above goes into some detail discussing just where the human input is done, how they tried to control for various considerations when using human input, and what some of the pitfalls were.

I’d certainly like to see this be deployed in the open and available to use as an alternative to Google Search.

You can see more examples of Sparrow chat sessions in Deepmind’s Sparrow chat repository and they include author’s ranking for truth, supportiveness and other metrics.

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