End-to-end Generative Optimization for AI Agents

Trace is a new AutoDiff-like tool for training AI systems end-to-end with general feedback (like numerical rewards or losses, natural language text, compiler errors, etc.). Trace generalizes the back-propagation algorithm by capturing and propagating an AI system's execution trace. Trace is implemented as a PyTorch-like Python library. Users write Python code directly and can use Trace primitives to optimize certain parts, just like training neural networks!

Paper | Project website | Documentation | Blogpost

Setup

Simply run

pip install trace-opt

Or for development, clone the repo and run the following.

pip install -e .

The library requires Python >= 3.9. The installation script will git clone AutoGen. You may require Git Large File Storage if git is unable to clone the repository otherwise.

Updates

• 2024.11.05 Ching-An Cheng gave a talk at UW Robotics Colloquium on Trace: video.
• 2024.10.21 New paper by Nvidia, Stanford, Visa, & Intel applies Trace to optimize for mapper code of parallel programming (for scientific computing and matrix multiplication). Trace (OptoPrime) learns code achieving 1.3X speed up under 10 minutes, compared to the code optimized by system engineer expert.
• 2024.9.30 Ching-An Cheng gave a talk to the AutoGen community: link.
• 2024.9.25 Trace Paper is accepted to NeurIPS 2024.
• 2024.9.14 TextGrad is available as an optimizer in Trace.
• 2024.8.18 Allen Nie gave a talk to Pasteur Labs & Institute for Simulation Intelligence.

QuickStart

Trace has two primitives: node and bundle. node is a primitive to define a node in the computation graph. bundle is a primitive to define a function that can be optimized.

from opto.trace import node

x = node(1, trainable=True)
y = node(3)
z = x / y
z2 = x / 3  # the int 3 would be converted to a node automatically

list_of_nodes = [x, node(2), node(3)]
node_of_list = node([1, 2, 3])

node_of_list.append(3)

# easy built-in computation graph visualization
z.backward("maximize z", visualize=True, print_limit=25)

Once a node is declared, all the following operations on the node object will be automatically traced. We built many magic functions to make a node object act like a normal Python object. By marking trainable=True, we tell our optimizer that this node's content can be changed by the optimizer.

For functions, Trace uses decorators like @bundle to wrap over Python functions. A bundled function behaves like any other Python functions.

from opto.trace import node, bundle


@bundle(trainable=True)
def strange_sort_list(lst):
    '''
    Given list of integers, return list in strange order.
    Strange sorting, is when you start with the minimum value,
    then maximum of the remaining integers, then minimum and so on.
    '''
    lst = sorted(lst)
    return lst


test_input = [1, 2, 3, 4]
test_output = strange_sort_list(test_input)
print(test_output)

Now, after declaring what is trainable and what isn't, and use node and bundle to define the computation graph, we can use the optimizer to optimize the computation graph.

import autogen
from opto.optimizers import OptoPrime


# we first declare a feedback function
# think of this as the reward function (or loss function)
def get_feedback(predict, target):
    if predict == target:
        return "test case passed!"
    else:
        return "test case failed!"


test_ground_truth = [1, 4, 2, 3]
test_input = [1, 2, 3, 4]

epoch = 2

optimizer = OptoPrime(strange_sort_list.parameters(),
                      config_list=autogen.config_list_from_json("OAI_CONFIG_LIST"))

for i in range(epoch):
    print(f"Training Epoch {i}")
    test_output = strange_sort_list(test_input)
    correctness = test_output.eq(test_ground_truth)
    feedback = get_feedback(test_output, test_ground_truth)

    if correctness:
        break

    optimizer.zero_feedback()
    optimizer.backward(correctness, feedback)
    optimizer.step()

Then, we can use the familiar PyTorch-like syntax to conduct the optimization.

Tutorials

Level	Tutorial	Run in Colab	Description
Beginner	Getting Started		Introduces basic primitives like node and bundle. Showcases a code optimization pipeline.
Beginner	Adaptive AI Agent		Introduce primitive model that allows anyone to build self-improving agents that react to environment feedback. Shows how an LLM agent learns to place a shot in a Battleship game.
Intermediate	Multi-Agent Collaboration	N/A	Demonstrates how Trace can be used for multi-agent collaboration environment in Virtualhome.
Intermediate	NLP Prompt Optimization		Shows how Trace can optimizes prompt and code together jointly for BigBench-Hard 23 tasks.
Advanced	Robotic Arm Control		Trace can optimize code to control a robotic arm after observing a full trajectory of interactions.

Supported Optimizers

Currently, we support three optimizers:

• OPRO: Large Language Models as Optimizers
• TextGrad: TextGrad: Automatic "Differentiation" via Text
• OptoPrime: Our proposed algorithm -- using the entire computational graph to perform parameter update. It is 2-3x faster than TextGrad.

Using our framework, you can seamlessly switch between different optimizers:

optimizer1 = OptoPrime(strange_sort_list.parameters())
optimizer2 = OPRO(strange_sort_list.parameters())
optimizer3 = TextGrad(strange_sort_list.parameters())

Here is a summary of the optimizers:

The table evaluates the frameworks in the following aspects:

• Computation Graph: Whether the optimizer leverages the computation graph of the workflow.
• Code as Functions: Whether the framework allows users to write actual executable Python functions and not require users to wrap them in strings.
• Library Support: Whether the framework has a library to support the optimizer.
• Speed: TextGrad is about 2-3x slower than OptoPrime (Trace). OPRO has no concept of computational graph, therefore is very fast.
• Large Graph: OptoPrime (Trace) represents the entire computation graph in context, therefore, might have issue with graphs that have more than hundreds of operations. TextGrad does not have the context-length issue, however, might be very slow on large graphs.

We provide a comparison to validate our implementation of TextGrad in Trace:

To produce this table, we ran the TextGrad pip-installed repo on 2024-10-30, and we also include the numbers reported in the TextGrad paper. The LLM APIs are called around the same time to ensure a fair comparison. TextGrad paper's result was reported in 2024-06.

You can also easily implement your own optimizer that works directly with TraceGraph (more tutorials on how to work with TraceGraph coming soon).

Citation

If you use this code in your research please cite the following publication:

@article{cheng2024trace,
  title={Trace is the Next AutoDiff: Generative Optimization with Rich Feedback, Execution Traces, and LLMs},
  author={Cheng, Ching-An and Nie, Allen and Swaminathan, Adith},
  journal={arXiv preprint arXiv:2406.16218},
  year={2024}
}

Papers / Projects that Use Trace

Improving Parallel Program Performance Through DSL-Driven Code Generation with LLM Optimizers Work from Stanford, NVIDIA, Intel, Visa Research.

@article{wei2024improving,
  title={Improving Parallel Program Performance Through DSL-Driven Code Generation with LLM Optimizers},
  author={Wei, Anjiang and Nie, Allen and Teixeira, Thiago SFX and Yadav, Rohan and Lee, Wonchan and Wang, Ke and Aiken, Alex},
  journal={arXiv preprint arXiv:2410.15625},
  year={2024}
}

The Importance of Directional Feedback for LLM-based Optimizers Explains the role of feedback in LLM-based optimizers. An early work that influenced Trace's clean separation between the platform, optimizer, and feedback.

@article{nie2024importance,
  title={The Importance of Directional Feedback for LLM-based Optimizers},
  author={Nie, Allen and Cheng, Ching-An and Kolobov, Andrey and Swaminathan, Adith},
  journal={arXiv preprint arXiv:2405.16434},
  year={2024}
}

Evaluation

A previous version of Trace was tested with gpt-4-0125-preview on numerical optimization, simulated traffic control, big-bench-hard, and llf-metaworld tasks, which demonstrated good optimization performance on multiple random seeds; please see the paper for details.

Note For gpt-4o, please use the version gpt-4o-2024-08-06 (onwards), which fixes the structured output issue of gpt-4o-2024-05-13. While gpt-4 works reliably most of the time, we've found gpt-4o-2024-05-13 often hallucinates even in very basic optimization problems and does not follow instructions. This might be due to the current implementation of optimizers rely on outputing in json format. Issues of gpt-4o with json have been reported in the communities ( see example).

Disclaimers

• Trace is an LLM-based optimization framework for research purpose only.
• The current release is a beta version of the library. Features and more documentation will be added, and some functionalities may be changed in the future.
• System performance may vary by workflow, dataset, query, and response, and users are responsible for determining the accuracy of generated content.
• System outputs do not represent the opinions of Microsoft.
• All decisions leveraging outputs of the system should be made with human oversight and not be based solely on system outputs.
• Use of the system must comply with all applicable laws, regulations, and policies, including those pertaining to privacy and security.
• The system should not be used in highly regulated domains where inaccurate outputs could suggest actions that lead to injury or negatively impact an individual's legal, financial, or life opportunities.

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Trademarks

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