Troubleshooting HTA Issues

Oct 13, 2025 by wbrum.org 4 views

Introduction

HTA (Hybrid Trace Analysis) is a powerful tool for analyzing and visualizing the performance of machine learning models. It provides a comprehensive set of features for understanding the behavior of models, including temporal breakdowns, idle time breakdowns, and GPU kernel breakdowns. However, users have reported issues with HTA, including errors when trying to use the analyzer.

What is HTA?

HTA is a Python library that provides a set of tools for analyzing and visualizing the performance of machine learning models. It uses the PyTorch Profiler to collect trace data, which is then analyzed and visualized using a variety of techniques.

Troubleshooting HTA Issues

In this article, we will explore some common issues with HTA and provide guidance on how to troubleshoot them.

Issue 1: Errors when using the analyzer

One common issue with HTA is errors when trying to use the analyzer. This can be caused by a variety of factors, including:

Incorrect trace file format: Make sure that the trace file is in the correct format and that it has been properly augmented with a rank.
Missing or corrupted data: Check that the trace file contains all the necessary data and that it has not been corrupted during collection.
Incorrect analyzer configuration: Make sure that the analyzer is properly configured and that it is using the correct settings.

Issue 2: IndexError when trying to get temporal breakdown

Another common issue with HTA is an IndexError when trying to get the temporal breakdown. This can be caused by a variety of factors, including:

Missing or corrupted data: Check that the trace file contains all the necessary data and that it has not been corrupted during collection.
Incorrect analyzer configuration: Make sure that the analyzer is properly configured and that it is using the correct settings.
Incorrect trace file format: Make sure that the trace file is in the correct format and that it has been properly augmented with a rank.

Troubleshooting Steps

To troubleshoot HTA issues, follow these steps:

Check the trace file format: Make sure that the trace file is in the correct format and that it has been properly augmented with a rank.
Check for missing or corrupted data: Check that the trace file contains all the necessary data and that it has not been corrupted during collection.
Check the analyzer configuration: Make sure that the analyzer is properly configured and that it is using the correct settings.
Check the HTA version: Make sure that you are using the latest version of HTA.
Check the PyTorch Profiler version: Make sure that you are using the latest version of the PyTorch Profiler.

Example Code

Here is an example of how to use HTA to analyze a PyTorch model:

import torch
import torch.profiler
from hta.trace_analysis import TraceAnalysis

# Create a PyTorch model
model = torch.nn.Linear(5, 3)

# Create a PyTorch profiler
profiler = torch.profiler.profile(
    activities=[torch.profiler.ProfilerActivity.CPU, torch.profiler.ProfilerActivity.CUDA],
    schedule=torch.profiler.schedule(wait=0, warmup=2, active=45, repeat=1),
    on_trace_ready=torch.profiler.tensorboard_trace_handler(dir_name='./logs'),
    profile_memory=True,
    record_shapes=True,
    with_stack=True
)

# Run the model
with profiler as prof:
    for i in range(100):
        model(torch.randn(5))

# Load the trace file
trace_dir = "./logs"
analyzer = TraceAnalysis(trace_dir=trace_dir)

# Get the temporal breakdown
time_spent_df = analyzer.get_temporal_breakdown()

Environment

HTA can be installed using pip:

pip install hta

Alternatively, you can install HTA from the source code:

git clone https://github.com/pytorch/hta.git
cd hta
pip install .

Conclusion

HTA is a powerful tool for analyzing and visualizing the performance of machine learning models. However, users have reported issues with HTA, including errors when trying to use the analyzer. By following the troubleshooting steps outlined in this article, you should be able to resolve these issues and use HTA effectively.

References

HTA Documentation
PyTorch Profiler Documentation
HTA Q&A ================

Frequently Asked Questions about HTA

Q: What is HTA?

A: HTA (Hybrid Trace Analysis) is a Python library that provides a set of tools for analyzing and visualizing the performance of machine learning models. It uses the PyTorch Profiler to collect trace data, which is then analyzed and visualized using a variety of techniques.

Q: What are the benefits of using HTA?

A: HTA provides a comprehensive set of features for understanding the behavior of machine learning models, including temporal breakdowns, idle time breakdowns, and GPU kernel breakdowns. This can help users identify performance bottlenecks and optimize their models for better performance.

Q: How do I install HTA?

A: HTA can be installed using pip:

pip install hta

Alternatively, you can install HTA from the source code:

git clone https://github.com/pytorch/hta.git
cd hta
pip install .

Q: How do I use HTA to analyze a PyTorch model?

A: Here is an example of how to use HTA to analyze a PyTorch model:

import torch
import torch.profiler
from hta.trace_analysis import TraceAnalysis

# Create a PyTorch model
model = torch.nn.Linear(5, 3)

# Create a PyTorch profiler
profiler = torch.profiler.profile(
    activities=[torch.profiler.ProfilerActivity.CPU, torch.profiler.ProfilerActivity.CUDA],
    schedule=torch.profiler.schedule(wait=0, warmup=2, active=45, repeat=1),
    on_trace_ready=torch.profiler.tensorboard_trace_handler(dir_name='./logs'),
    profile_memory=True,
    record_shapes=True,
    with_stack=True
)

# Run the model
with profiler as prof:
    for i in range(100):
        model(torch.randn(5))

# Load the trace file
trace_dir = "./logs"
analyzer = TraceAnalysis(trace_dir=trace_dir)

# Get the temporal breakdown
time_spent_df = analyzer.get_temporal_breakdown()

Q: What are some common issues with HTA?

A: Some common issues with HTA include:

Incorrect trace file format: Make sure that the trace file is in the correct format and that it has been properly augmented with a rank.
Missing or corrupted data: Check that the trace file contains all the necessary data and that it has not been corrupted during collection.
Incorrect analyzer configuration: Make sure that the analyzer is properly configured and that it is using the correct settings.

Q: How do I troubleshoot HTA issues?

A: To troubleshoot HTA issues, follow these steps:

Check the trace file format: Make sure that the trace file is in the correct format and that it has been properly augmented with a rank.
Check for missing or corrupted data: Check that the trace file contains all the necessary data and that it has not been corrupted during collection.
Check the analyzer configuration: Make sure that the analyzer is properly configured and that it is using the correct settings.
Check the HTA version: Make sure that you are using the latest version of HTA.
Check the PyTorch Profiler version: Make sure that you are using the latest version of the PyTorch Profiler.

Q: Can I use HTA with other deep learning frameworks?

A: Yes, HTA can be used with other deep learning frameworks, including TensorFlow and Keras. However, you will need to modify the HTA code to work with the specific framework you are using.

Q: Is HTA open-source?

A: Yes, HTA is open-source and can be found on GitHub: https://github.com/pytorch/hta