Fix several syntax error

[HollowMan6]

What does this PR do ?

*** Error compiling './Megatron-LM/examples/multimodal/evaluation/evaluate_mmmu.py'...
File "./Megatron-LM/examples/multimodal/evaluation/evaluate_mmmu.py", line 107
m = re.search("'Overall': {'num': \d+, 'acc': (\d.\d+)}", output.stdout)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: invalid escape sequence '\d'

*** Error compiling './Megatron-LM/megatron/legacy/model/vision/esvit_swin_backbone.py'...
File "./Megatron-LM/megatron/legacy/model/vision/esvit_swin_backbone.py", line 729
or pretrained_layers[0] is '*'
^^^^^^^^^^^^^^^^^^^^^^^^^^^
SyntaxError: "is" with a literal. Did you mean "=="?

*** Error compiling './Megatron-LM/tests/test_utils/python_scripts/launch_nemo_run_workload.py'...
File "./Megatron-LM/tests/test_utils/python_scripts/launch_nemo_run_workload.py", line 137
logger.info(f"Job succeeded with status: {job_dict["status"]}")
^^^^^^
SyntaxError: f-string: unmatched '['

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[Copilot]

Pull request overview

This PR fixes three Python syntax errors that would prevent the code from compiling:

1. An f-string syntax error caused by unmatched quotes in nested dictionary access
2. Multiple instances of using is operator with string literals instead of ==
3. An invalid escape sequence in a regex pattern string

Changes:

• Fixed f-string syntax by changing double quotes to single quotes inside f-string interpolations
• Replaced is operator with == for string literal comparisons in three locations
• Added raw string prefix r to regex pattern to properly handle escape sequences

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
tests/test_utils/python_scripts/launch_nemo_run_workload.py	Fixed f-string syntax error by using single quotes for dictionary key access within f-string interpolations
megatron/legacy/model/vision/esvit_swin_backbone.py	Replaced three instances of is '*' with == '*' to properly compare string values
examples/multimodal/evaluation/evaluate_mmmu.py	Added raw string prefix to regex pattern to fix invalid escape sequence error

---

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[dimapihtar]

LGTM. Thank you!

[dimapihtar]

/ok to test 72eb942

[HollowMan6]

Added the copyright header, CI should all pass now.

cc: @dimapihtar

[yaox12]

/ok to test 3b6c2f7