Fix: use raw string for CALIBRATION_TEXT

[GaetanLepage]

Use a raw string to prevent LaTeX codes from being interpreted as escape sequences.

/nix/store/cfapjd2rvqrpry4grb0kljnp8bvnvfxz-python3-3.13.8/lib/python3.13/ast.py:50: in parse
    return compile(source, filename, mode, flags,
E     File "/build/source/keras/src/quantizers/gptq_test.py", line 37
E       matrix $\hat{W}$ that minimizes the mean squared error of the layer's
E               ^^
E   SyntaxError: invalid escape sequence '\h'

[gemini-code-assist]

Summary of Changes

Hello @GaetanLepage, 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 addresses a SyntaxError by modifying how a specific text string is defined. By converting the string to a raw string, the change ensures that special characters, particularly backslashes, are interpreted literally rather than as escape sequences, thus preventing parsing errors and maintaining the intended content of the string.

Highlights

• Bug Fix: Resolved a SyntaxError: invalid escape sequence that occurred due to LaTeX-like codes within the CALIBRATION_TEXT string.
• String Handling: The CALIBRATION_TEXT variable has been converted to a raw string literal to ensure that backslashes are treated as literal characters and not as escape sequences.

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[gemini-code-assist]

Code Review

This pull request addresses a SyntaxError in keras/src/quantizers/gptq_test.py. The error, invalid escape sequence '\h', originates from the CALIBRATION_TEXT multiline string which contains LaTeX-style markup such as \hat{W}. The Python interpreter attempts to parse \h as an escape sequence, which is invalid. The fix correctly converts the string to a raw string literal by adding an r prefix (r"""..."""), ensuring backslashes are treated as literal characters. This change is correct and effectively resolves the syntax error.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.63%. Comparing base (960133e) to head (ec3a9b4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21790   +/-   ##
=======================================
  Coverage   82.63%   82.63%           
=======================================
  Files         577      577           
  Lines       59321    59321           
  Branches     9300     9300           
=======================================
  Hits        49020    49020           
  Misses       7913     7913           
  Partials     2388     2388           

Flag	Coverage Δ
keras	82.45% <ø> (ø)
keras-jax	63.32% <ø> (ø)
keras-numpy	57.55% <ø> (ø)
keras-openvino	34.29% <ø> (ø)
keras-tensorflow	64.11% <ø> (ø)
keras-torch	63.62% <ø> (ø)

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[hertschuh]

Thanks for the fix!