⚡️ Speed up _get_verbosity() by 10% in libs/langchain/langchain/chains/base.py

[codeflash-ai]

📄 _get_verbosity() in libs/langchain/langchain/chains/base.py

📈 Performance went up by 10% (0.10x faster)

⏱️ Runtime went down from 500.11μs to 455.01μs

Explanation and details

(click to show)

If you consider the imports at the top, it can slightly enhance the performance especially when the functions are repetitively called. Secondly, if the method of using langchain.verbose is deprecated, it might be better to solely rely on _verbose unless there's a necessity to consider the old version.

Note: It depends on your use case, shifting the imports to the top is not always the best practice especially in larger codebases where you may want to avoid cyclic dependency issues or large initial load times. It's a trade-off between resources on initial load and performance on subsequent usage. You should consider your specific application's requirements and performance characteristics to make this judgement.

Correctness verification

The new optimized code was tested for correctness. The results are listed below.

✅ 7 Passed − ⚙️ Existing Unit Tests

✅ 0 Passed − 🎨 Inspired Regression Tests

✅ 10 Passed − 🌀 Generated Regression Tests

(click to show generated tests)

# imports
import pytest  # used for our unit tests
import warnings
from unittest.mock import patch

# Assuming the langchain package and its globals module are available for import.
# If not, these would need to be mocked for the tests to run.

# function to test
# Note: The actual implementation of get_verbose() is not provided here.
# The following is a placeholder for the actual implementation.
def get_verbose() -> bool:
    """Get the value of the `verbose` global setting."""
    import langchain
    with warnings.catch_warnings():
        warnings.filterwarnings(
            "ignore",
            message=(
                "Importing verbose from langchain root module is no longer supported"
            ),
        )
        old_verbose = langchain.verbose
    global _verbose
    return _verbose or old_verbose
from langchain.chains.base import _get_verbosity
# unit tests

# Test the default verbosity setting when neither _verbose nor old_verbose have been set
def test_default_verbosity():
    with patch('langchain.verbose', False), patch('langchain.globals._verbose', False):
        assert not _get_verbosity()

# Test when _verbose is True but old_verbose is not set
def test_verbose_true_old_verbose_unset():
    with patch('langchain.verbose', False), patch('langchain.globals._verbose', True):
        assert _get_verbosity()

# Test when old_verbose is True regardless of _verbose
def test_old_verbose_true():
    with patch('langchain.verbose', True):
        assert _get_verbosity()

# Test when both _verbose and old_verbose are False
def test_both_verbose_false():
    with patch('langchain.verbose', False), patch('langchain.globals._verbose', False):
        assert not _get_verbosity()

# Test when both _verbose and old_verbose are True
def test_both_verbose_true():
    with patch('langchain.verbose', True), patch('langchain.globals._verbose', True):
        assert _get_verbosity()

# Test the function does not raise a deprecation warning
def test_no_deprecation_warning():
    with patch('langchain.verbose', True), patch('langchain.globals._verbose', True), warnings.catch_warnings(record=True) as w:
        warnings.simplefilter("always")
        _get_verbosity()
        assert not w  # No warnings were raised

# Test _verbose is not a boolean
def test_verbose_not_boolean():
    with patch('langchain.verbose', 'yes'), patch('langchain.globals._verbose', 1):
        assert _get_verbosity()

# Test langchain.verbose is monkey-patched
def test_langchain_verbose_monkey_patched():
    with patch('langchain.verbose', new_callable=lambda: True):
        assert _get_verbosity()

# Test warnings module is monkey-patched
def test_warnings_monkey_patched():
    with patch('warnings.catch_warnings') as mock_warnings:
        mock_warnings.side_effect = RuntimeError("Cannot catch warnings")
        with pytest.raises(RuntimeError):
            _get_verbosity()

# Test for race condition in a multithreaded environment
# This test simulates a change in the global _verbose variable during the function call
def test_race_condition():
    with patch('langchain.verbose', False):
        with patch('langchain.globals._verbose', False) as mock_verbose:
            mock_verbose.side_effect = [False, True]  # Change during the call
            assert _get_verbosity()  # Should be True because of the race condition

# Note: The following test is for illustrative purposes and assumes the existence of a set_verbose function.
# Test after migration to set_verbose()
def test_migration_to_set_verbose():
    with patch('langchain.globals.set_verbose') as mock_set_verbose, patch('langchain.verbose', new_callable=lambda: False):
        mock_set_verbose(True)
        assert _get_verbosity()  # Assuming set_verbose() effectively sets the verbosity level

# Note: Some of the tests above use patching techniques that might not be necessary or applicable if the langchain package and its globals module are implemented differently.