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fix :langchain for text classification task #740

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Merged
ArshaanNazir merged 3 commits into from
Sep 1, 2023
Merged

fix :langchain for text classification task #740

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4b261de
fix import PromptTemplate
Prikshit7766 Sep 1, 2023
01ab6fd
add _check_langchain_package
Prikshit7766 Sep 1, 2023
a955472
minor fix
Prikshit7766 Sep 1, 2023
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16 changes: 13 additions & 3 deletions langtest/modelhandler/transformers_modelhandler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,8 +10,8 @@
SequenceClassificationOutput,
TranslationOutput,
)

from langchain import PromptTemplate
from langtest.utils.lib_manager import try_import_lib
import importlib


class PretrainedModelForNER(_ModelHandler):
Expand Down Expand Up @@ -357,6 +357,16 @@ def __init__(self, hub, model, **kwargs):
)
self.model = model

def _check_langchain_package(self):
LIB_NAME = "langchain"
if try_import_lib(LIB_NAME):
langchain = importlib.import_module(LIB_NAME)
self.PromptTemplate = getattr(langchain, "PromptTemplate")
else:
raise ModuleNotFoundError(
f"The '{LIB_NAME}' package is not installed. Please install it using 'pip install {LIB_NAME}'."
)

@staticmethod
def load_model(hub: str, path: str, **kwargs) -> "Pipeline":
"""Load the QA model into the `model` attribute.
Expand All @@ -383,7 +393,7 @@ def predict(self, text: Union[str, dict], prompt: dict, **kwargs) -> str:
Returns:
str: Output model for QA tasks
"""
prompt_template = PromptTemplate(**prompt)
prompt_template = self.PromptTemplate(**prompt)
p = prompt_template.format(**text)
prediction = self.model(p, **kwargs)
return prediction[0]["generated_text"][len(p) :]
Expand Down