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shroom_classifier_v1_persona.py
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shroom_classifier_v1_persona.py
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# -*- coding: utf-8 -*-
from operator import itemgetter
from langchain.chat_models import ChatOpenAI
from langchain.prompts import ChatPromptTemplate
from langchain_core.output_parsers import StrOutputParser
class ShroomClassifier:
"""Represents a classifier for the SHROOM evaluation dataset."""
PERSONA = {
"translator": "a translator concerned that the output is a good translation",
"lexicographer": "a lexicographer concerned that the output is describing the meaning of the word",
"editor": "an editor concerned that the output is understandable",
"writer": "a creative writer concerned that the output is engaging",
"grammarian": "a grammarian concerned that the output is grammatical",
"lawyer": "a lawyer concerned that the output is truthful",
}
TASK = {
"DM": "Your given task is Definition Modeling, meaning that the goal of the language model is to generate a definition for the term between the '<define>' and '</define>' delimiters in the input.",
"PG": "Your given task is Paraphrase Generation, meaning that the goal of the language model is to generate a paraphrase of the input.",
"MT": "Your given task is Machine Translation, meaning that the goal of the language model is to generate a natural language translation of the input.",
"TS": "Your given task is Text Simplification, meaning that the goal of the language model is to generate a simplified version of the input.",
}
RATIONALE_GENERATION_PROMPT = """{task}
You are provided with an input and output pair, as well as a target that you need to use
to determine if the output is correct and accurate, or if it is a hallucination, defined as an output
that is incorrect, off point, or contains extraneous information that cannot be reasonably inferred from the input.
Provide a succinct rationale arguing for or against the assertion that the output is a hallucination,
based on your expertise as {persona}, restricting yourself to judgments solely within your expertise.
Input: {src}
Target: {tgt}
Output: {hyp}
Rationale:
"""
ANSWER_GENERATION_PROMPT = """Input: {src}
Target: {tgt}
Output: {hyp}
Rationale: {rationale}
Now using the argument provided in the above rationale, answer the question: is the output a hallucination?
Answer 'Hallucination' if the output is a hallucination, or 'Not Hallucination' if it is not a hallucination. Only answer
'Hallucination' or 'Not Hallucination'.
Answer:
"""
def __init__(self, model_name="gpt-4", temperature=0.1):
"""
Initializes a classifier for the SemEval 2024 Task 6, "".
Parameters:
model_name: The name of the model to be used for zero shot CoT classification (default "gpt-4").
temperature: The temperature parameter for the model (default 0.1).
"""
self.model_name = model_name
self.temperature = temperature
self.llm = self._llm(model_name, temperature)
self.chain = self._zero_shot_chain_of_thought()
def _llm(self, model_name, temperature):
if model_name in [
"gpt-4",
"gpt-3.5-turbo",
"gpt-4-1106-preview",
]:
return ChatOpenAI(model_name=model_name, temperature=temperature, request_timeout=100)
# elif model_name in [
# "gpt-3.5-turbo-instruct"
# ]:
# return OpenAI(model_name=model_name, temperature=temperature, request_timeout=100)
# elif model_name in [
# "meta-llama/Llama-2-70b-chat-hf",
# "google/flan-t5-xxl",
# ]:
# return HuggingFaceHub(repo_id=model_name, model_kwargs={ "temperature": temperature })
else:
raise Exception(f'Model {model_name} not supported')
def _zero_shot_chain_of_thought(self):
"""
Creates a LCEL chain that implements a zero-shot
chain of thought (CoT) using a specification.
"""
rationale_generation = (
ChatPromptTemplate.from_template(self.RATIONALE_GENERATION_PROMPT)
| self.llm
| StrOutputParser()
)
answer_generation = (
{
"rationale": rationale_generation,
"hyp": itemgetter("hyp"),
"src": itemgetter("src"),
"tgt": itemgetter("tgt"),
}
| ChatPromptTemplate.from_template(self.ANSWER_GENERATION_PROMPT)
| self.llm
| StrOutputParser()
)
return answer_generation
def classify(self, dp):
"""
Determines whether or not the output (hyp) is a hallucination.
Parameters:
task: The task associated with a datapoint. One of "DM", "PG", "MT", or "TS".
src: The input passed to a model.
tgt: The intended reference "gold" text that the model ought to generate
hyp: The output the model generated.
Returns:
A dict containing a classification of the output based on the task, persona, input, output and target.
"""
predictions = self.chain.batch(
[
{
"task": self.TASK[dp["task"]],
"persona": self.PERSONA[persona],
"src": dp["src"],
"tgt": dp["tgt"],
"hyp": dp["hyp"]
} for persona in self.PERSONA
]
)
weight = 1./float(len(predictions))
predicted_p = float(sum([ weight for prediction in predictions if prediction == 'Hallucination' ]))
if predicted_p > 0.5:
predicted = "Hallucination"
else:
predicted = "Not Hallucination"
if "id" in dp:
return { "id": dp["id"], "label": predicted, "p(Hallucination)": predicted_p }
else:
return { "label": predicted, "p(Hallucination)": predicted_p }