Add 'prefix' argument to temp_flip_flag function

[samanklesaria]

New functionality needs to often be tested in both graph mode and tree mode. Currently, setting graph mode is not possible with the temp_flip_flag function. This PR allows it to be used.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the temp_flip_flag context manager by introducing a configurable prefix for feature flags. This modification significantly improves the utility of the function, allowing it to temporarily adjust a wider range of configuration variables, which is particularly beneficial for testing new features across different operational modes like graph and tree modes.

Highlights

• Enhanced temp_flip_flag function: The temp_flip_flag context manager now accepts an optional prefix argument, defaulting to 'flax'. This allows it to be used with configuration variables that do not use the 'flax_' prefix, such as those for graph mode testing.
• Improved Flexibility for Testing: This change enables new functionality to be tested more easily in both graph mode and tree mode, addressing a previous limitation where setting graph mode was not possible with temp_flip_flag.

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Changelog

• flax/configurations.py
  • Modified the temp_flip_flag function signature to include a prefix argument with a default value of 'flax'.
  • Updated the internal logic of temp_flip_flag to use the provided prefix when constructing configuration variable names.
  • Added a missing newline character at the end of the file.

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[gemini-code-assist]

Code Review

This pull request introduces a prefix argument to the temp_flip_flag function, making it more flexible for flipping feature flags with different prefixes. The implementation is straightforward. I've left a couple of comments regarding documentation and code style. Additionally, it would be beneficial to add a unit test case to tests/configurations_test.py to cover this new functionality with a non-default prefix.

[gemini-code-assist]

The new prefix parameter should be documented in the function's docstring. Please add a description for prefix in the Args section. Additionally, the description for var_name is now outdated and should be updated to refer to the generic prefix instead of hardcoding 'flax_'.

[gemini-code-assist]

For consistency with the previous implementation and for better readability, it's preferable to use f-strings for constructing the flag name instead of string concatenation. This also makes the code less repetitive if you store the f-string in a variable.

Suggested change

	old_value = getattr(self, prefix + '_' + var_name)
	try:
	self.update(f'flax_{var_name}', var_value)
	self.update(prefix + '_' + var_name, var_value)
	yield
	finally:
	self.update(f'flax_{var_name}', old_value)
	self.update(prefix + '_' + var_name, old_value)
	flag_name = f'{prefix}_{var_name}'
	old_value = getattr(self, flag_name)
	try:
	self.update(flag_name, var_value)
	yield
	finally:
	self.update(flag_name, old_value)