update parse meta

[yiliu30]

Signed-off-by: yiliu30 yi4.liu@intel.com

[gemini-code-assist]

Summary of Changes

Hello @yiliu30, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the parse_metadata.py example script by introducing more detailed tensor analysis capabilities. It now captures the minimum and maximum values of tensors and specifically tracks and summarizes torch.float8_e4m3fn tensors, providing a clearer overview of their presence and patterns within .safetensors files. This improves the utility of the script for model inspection and analysis, particularly for models utilizing lower-precision data types.

Highlights

• Tensor Value Extraction: The script now extracts and records the minimum and maximum values for each tensor found within .safetensors files.
• FP8 Tensor Identification and Summary: Added functionality to specifically identify torch.float8_e4m3fn (FP8) tensors. After processing, it provides a summarized list of these FP8 tensors, generalizing their names by replacing specific layer indices with wildcards (e.g., .0. becomes .*.).
• CSV Output Enhancement: The generated CSV file now includes two new columns, 'min' and 'max', to store the extracted minimum and maximum values for each tensor.

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[gemini-code-assist]

Code Review

This pull request updates the parse_metadata.py script to extract and include the minimum and maximum values of tensors in the output CSV. It also adds logic to identify and print a generalized list of FP8 tensor names. My review focuses on improving the efficiency and robustness of the new code. I've suggested using regular expressions for more efficient string manipulation and refining the error handling to be more explicit and readable.

[gemini-code-assist]

This block for getting min/max values can be simplified. Also, using a bare except is discouraged as it can catch system-level exceptions like KeyboardInterrupt. It's better to handle the success case and the exception case more explicitly to improve readability and robustness. This suggestion refactors the logic to be cleaner and uses except Exception:.

Suggested change

	tensor_min, tensor_max = "N/A", "N/A"
	try:
	tensor_min, tensor_max = tensor.min().item(), tensor.max().item()
	except:
	pass
	tensor_min, tensor_max = str(tensor_min), str(tensor_max)
	try:
	tensor_min = str(tensor.min().item())
	tensor_max = str(tensor.max().item())
	except Exception:
	tensor_min, tensor_max = "N/A", "N/A"

[gemini-code-assist]

The current implementation with a nested loop to replace layer indices is inefficient as it iterates 200 times for each tensor name. A more efficient and robust approach is to use a regular expression. This can be made even more concise and Pythonic using a set comprehension. This also removes the hardcoded limit of 200 for layer indices.

Note: you will need to add import re at the top of the file.

Suggested change

	filtered_fp8_tensors = set()
	for name in fp8_tensors_name:
	filtered_name = name
	for idx in range(200):
	filtered_name = filtered_name.replace(f".{idx}.", ".*.")
	filtered_fp8_tensors.add(filtered_name)
	filtered_fp8_tensors = {re.sub(r'\.\d+\.', '.*.', name) for name in fp8_tensors_name}