mirror of https://github.com/hwchase17/langchain
[simple][test] Added test case for schema.py (#3692)
- added unittest for schema.py covering utility functions and token counting. - fixed a nit. based on huggingface doc, the tokenizer model is gpt-2. [link](https://huggingface.co/transformers/v4.8.2/_modules/transformers/models/gpt2/tokenization_gpt2_fast.html) - make lint && make format, passed on local - screenshot of new test running result <img width="1283" alt="Screenshot 2023-04-27 at 9 51 55 PM" src="https://user-images.githubusercontent.com/62768671/235057441-c0ac3406-9541-453f-ba14-3ebb08656114.png">pull/3748/head
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"""Test formatting functionality."""
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from langchain.schema import _get_num_tokens_default_method
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class TestTokenCountingWithGPT2Tokenizer:
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def test_empty_token(self) -> None:
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assert _get_num_tokens_default_method("") == 0
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def test_multiple_tokens(self) -> None:
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assert _get_num_tokens_default_method("a b c") == 3
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def test_special_tokens(self) -> None:
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# test for consistency when the default tokenizer is changed
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assert _get_num_tokens_default_method("a:b_c d") == 6
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"""Test formatting functionality."""
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import unittest
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from langchain.schema import (
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AIMessage,
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HumanMessage,
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SystemMessage,
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get_buffer_string,
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messages_from_dict,
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messages_to_dict,
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)
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class TestGetBufferString(unittest.TestCase):
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human_msg: HumanMessage = HumanMessage(content="human")
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ai_msg: AIMessage = AIMessage(content="ai")
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sys_msg: SystemMessage = SystemMessage(content="sys")
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def test_empty_input(self) -> None:
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self.assertEqual(get_buffer_string([]), "")
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def test_valid_single_message(self) -> None:
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expected_output = f"Human: {self.human_msg.content}"
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self.assertEqual(
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get_buffer_string([self.human_msg]),
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expected_output,
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)
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def test_custom_human_prefix(self) -> None:
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prefix = "H"
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expected_output = f"{prefix}: {self.human_msg.content}"
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self.assertEqual(
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get_buffer_string([self.human_msg], human_prefix="H"),
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expected_output,
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)
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def test_custom_ai_prefix(self) -> None:
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prefix = "A"
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expected_output = f"{prefix}: {self.ai_msg.content}"
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self.assertEqual(
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get_buffer_string([self.ai_msg], ai_prefix="A"),
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expected_output,
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)
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def test_multiple_msg(self) -> None:
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msgs = [self.human_msg, self.ai_msg, self.sys_msg]
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expected_output = "\n".join(
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[
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f"Human: {self.human_msg.content}",
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f"AI: {self.ai_msg.content}",
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f"System: {self.sys_msg.content}",
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]
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)
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self.assertEqual(
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get_buffer_string(msgs),
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expected_output,
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)
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class TestMessageDictConversion(unittest.TestCase):
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human_msg: HumanMessage = HumanMessage(
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content="human", additional_kwargs={"key": "value"}
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)
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ai_msg: AIMessage = AIMessage(content="ai")
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sys_msg: SystemMessage = SystemMessage(content="sys")
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def test_multiple_msg(self) -> None:
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msgs = [
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self.human_msg,
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self.ai_msg,
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self.sys_msg,
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]
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self.assertEqual(
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messages_from_dict(messages_to_dict(msgs)),
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msgs,
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)
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