[codex] Fix PyTorch choice without replacement

[FlorianPfaff]

Summary

• Fix the PyTorch backend random.choice(..., replace=False) path to sample unique indices with torch.randperm instead of torch.randint.
• Normalize PyTorch choice size handling so sampled indices are reshaped to the requested output size.
• Add a PyTorch-only regression test that samples the full population without replacement and verifies the results are unique.

Root cause

The unweighted PyTorch choice branch ignored replace=False and always used torch.randint, which samples each index independently and can return duplicates.

Validation

• Not run locally; this session has a read-only filesystem, so the change was made through the GitHub connector. CI should run on the PR.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	15.61s
✅ JSON	prettier	2	0	0	0	0.59s
✅ JSON	v8r	2		0	0	2.77s
✅ MARKDOWN	markdownlint	2	0	0	0	0.72s
✅ MARKDOWN	markdown-table-formatter	2	0	0	0	0.22s
✅ PYTHON	bandit	382		0	0	6.28s
✅ PYTHON	black	382	33	0	0	11.52s
✅ PYTHON	flake8	382		0	0	3.4s
✅ PYTHON	isort	382	36	0	0	0.79s
✅ PYTHON	mypy	382		0	0	5.54s
✅ PYTHON	pylint	382		0	0	121.29s
✅ PYTHON	ruff	382	36	0	0	0.09s
✅ REPOSITORY	checkov	yes		no	no	24.45s
✅ REPOSITORY	gitleaks	yes		no	no	7.99s
✅ REPOSITORY	git_diff	yes		no	no	0.05s
✅ REPOSITORY	secretlint	yes		no	no	7.67s
✅ REPOSITORY	syft	yes		no	no	6.04s
✅ REPOSITORY	trivy-sbom	yes		no	no	2.12s
✅ REPOSITORY	trufflehog	yes		no	no	20.5s
✅ YAML	prettier	4	0	0	0	0.52s
✅ YAML	v8r	4		0	0	6.05s
✅ YAML	yamllint	4		0	0	0.47s

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[github-actions]

Test Results

    12 files  +    4      12 suites  +4   4h 49m 35s ⏱️ + 3h 3m 55s
 1 091 tests +    1   1 091 ✅ +    1      0 💤 ±  0  0 ❌ ±0 
13 376 runs  +4 444  10 276 ✅ +3 672  3 100 💤 +772  0 ❌ ±0 

Results for commit 593b3da. ± Comparison against base commit 24543a9.