⚡️ Speed up method MultipartUploadManager._get_file_type by 21%

[codeflash-ai]

📄 21% (0.21x) speedup for MultipartUploadManager._get_file_type in src/together/filemanager.py

⏱️ Runtime : 3.58 microseconds → 2.96 microseconds (best of 56 runs)

📝 Explanation and details

The optimization replaces a chain of if-elif-else statements with a dictionary lookup using a try-except pattern. Instead of sequentially checking each file extension condition (which requires up to 3 comparisons in the worst case), the optimized version performs a single dictionary lookup operation.

Key changes:

• Replaced if file.suffix == ".jsonl": elif file.suffix == ".parquet": elif file.suffix == ".csv": with a dictionary mapping {".jsonl": "jsonl", ".parquet": "parquet", ".csv": "csv"}
• Used try-except KeyError pattern instead of final else clause for error handling
• Cached file.suffix in a variable to avoid repeated attribute access

Why this is faster:
Dictionary lookups in Python are O(1) average case operations using hash tables, while chained conditionals require O(n) sequential comparisons. Even with only 3 extensions, the dictionary approach eliminates the need for multiple string equality checks and reduces the number of attribute accesses to file.suffix.

The 20% speedup is achieved because:

1. Dictionary hash lookup is more efficient than sequential string comparisons
2. Single attribute access (ext = file.suffix) vs multiple accesses in conditionals
3. Fewer branching instructions in the CPU

This optimization is particularly beneficial when the method is called frequently with different file types, as the performance gain is consistent regardless of which extension is being processed.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	🔘 None Found
⏪ Replay Tests	✅ 4 Passed
🔎 Concolic Coverage Tests	✅ 2 Passed
📊 Tests Coverage	100.0%

⏪ Replay Tests and Runtime

🔎 Concolic Coverage Tests and Runtime

Test File::Test Function	Original ⏱️	Optimized ⏱️	Speedup
codeflash_concolic_atws5rsq/tmp5ztve0gt/test_concolic_coverage.py::test_MultipartUploadManager__get_file_type	3.58μs	2.96μs	21.0%✅

To edit these changes git checkout codeflash/optimize-MultipartUploadManager._get_file_type-mgzxwtu2 and push.