mirror of
https://github.com/hwchase17/langchain
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74 lines
2.6 KiB
Python
74 lines
2.6 KiB
Python
"""Test functionality related to ngram overlap based selector."""
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import pytest
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from langchain.prompts.example_selector.ngram_overlap import (
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NGramOverlapExampleSelector,
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ngram_overlap_score,
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)
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from langchain.prompts.prompt import PromptTemplate
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EXAMPLES = [
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{"input": "See Spot run.", "output": "foo1"},
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{"input": "My dog barks.", "output": "foo2"},
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{"input": "Spot can run.", "output": "foo3"},
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]
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@pytest.fixture
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def selector() -> NGramOverlapExampleSelector:
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"""Get ngram overlap based selector to use in tests."""
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prompts = PromptTemplate(
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input_variables=["input", "output"], template="Input: {input}\nOutput: {output}"
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)
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selector = NGramOverlapExampleSelector(
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examples=EXAMPLES,
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example_prompt=prompts,
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)
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return selector
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def test_selector_valid(selector: NGramOverlapExampleSelector) -> None:
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"""Test NGramOverlapExampleSelector can select examples."""
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sentence = "Spot can run."
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output = selector.select_examples({"input": sentence})
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assert output == [EXAMPLES[2], EXAMPLES[0], EXAMPLES[1]]
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def test_selector_add_example(selector: NGramOverlapExampleSelector) -> None:
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"""Test NGramOverlapExampleSelector can add an example."""
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new_example = {"input": "Spot plays fetch.", "output": "foo4"}
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selector.add_example(new_example)
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sentence = "Spot can run."
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output = selector.select_examples({"input": sentence})
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assert output == [EXAMPLES[2], EXAMPLES[0]] + [new_example] + [EXAMPLES[1]]
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def test_selector_threshold_zero(selector: NGramOverlapExampleSelector) -> None:
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"""Tests NGramOverlapExampleSelector threshold set to 0.0."""
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selector.threshold = 0.0
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sentence = "Spot can run."
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output = selector.select_examples({"input": sentence})
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assert output == [EXAMPLES[2], EXAMPLES[0]]
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def test_selector_threshold_more_than_one(
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selector: NGramOverlapExampleSelector,
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) -> None:
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"""Tests NGramOverlapExampleSelector threshold greater than 1.0."""
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selector.threshold = 1.0 + 1e-9
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sentence = "Spot can run."
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output = selector.select_examples({"input": sentence})
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assert output == []
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def test_ngram_overlap_score(selector: NGramOverlapExampleSelector) -> None:
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"""Tests that ngram_overlap_score returns correct values."""
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selector.threshold = 1.0 + 1e-9
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none = ngram_overlap_score(["Spot can run."], ["My dog barks."])
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some = ngram_overlap_score(["Spot can run."], ["See Spot run."])
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complete = ngram_overlap_score(["Spot can run."], ["Spot can run."])
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check = [abs(none - 0.0) < 1e-9, 0.0 < some < 1.0, abs(complete - 1.0) < 1e-9]
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assert check == [True, True, True]
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