[Feature] Add support for RAG evaluation (#1154)

Co-authored-by: Deven Patel <deven298@yahoo.com>
Co-authored-by: Deshraj Yadav <deshrajdry@gmail.com>

embedchain/config/eval/base.py

@@ -0,0 +1,92 @@
+from typing import Optional
+
+from embedchain.config.base_config import BaseConfig
+
+ANSWER_RELEVANCY_PROMPT = """
+Please provide $num_gen_questions questions from the provided answer.
+You must provide the complete question, if are not able to provide the complete question, return empty string ("").
+Please only provide one question per line without numbers or bullets to distinguish them.
+You must only provide the questions and no other text.
+
+$answer
+"""  # noqa:E501
+
+
+CONTEXT_RELEVANCY_PROMPT = """
+Please extract relevant sentences from the provided context that is required to answer the given question.
+If no relevant sentences are found, or if you believe the question cannot be answered from the given context, return the empty string ("").
+While extracting candidate sentences you're not allowed to make any changes to sentences from given context or make up any sentences.
+You must only provide sentences from the given context and nothing else.
+
+Context: $context
+Question: $question
+"""  # noqa:E501
+
+GROUNDEDNESS_ANSWER_CLAIMS_PROMPT = """
+Please provide one or more statements from each sentence of the provided answer.
+You must provide the symantically equivalent statements for each sentence of the answer.
+You must provide the complete statement, if are not able to provide the complete statement, return empty string ("").
+Please only provide one statement per line WITHOUT numbers or bullets.
+If the question provided is not being answered in the provided answer, return empty string ("").
+You must only provide the statements and no other text.
+
+$question
+$answer
+"""  # noqa:E501
+
+GROUNDEDNESS_CLAIMS_INFERENCE_PROMPT = """
+Given the context and the provided claim statements, please provide a verdict for each claim statement whether it can be completely infered from the given context or not.
+Use only "1" (yes), "0" (no) and "-1" (null) for "yes", "no" or "null" respectively.
+You must provide one verdict per line, ONLY WITH "1", "0" or "-1" as per your verdict to the given statement and nothing else.
+You must provide the verdicts in the same order as the claim statements.
+
+Contexts: 
+$context
+
+Claim statements: 
+$claim_statements
+"""  # noqa:E501
+
+
+class GroundednessConfig(BaseConfig):
+    def __init__(
+        self,
+        model: str = "gpt-4",
+        api_key: Optional[str] = None,
+        answer_claims_prompt: str = GROUNDEDNESS_ANSWER_CLAIMS_PROMPT,
+        claims_inference_prompt: str = GROUNDEDNESS_CLAIMS_INFERENCE_PROMPT,
+    ):
+        self.model = model
+        self.api_key = api_key
+        self.answer_claims_prompt = answer_claims_prompt
+        self.claims_inference_prompt = claims_inference_prompt
+
+
+class AnswerRelevanceConfig(BaseConfig):
+    def __init__(
+        self,
+        model: str = "gpt-4",
+        embedder: str = "text-embedding-ada-002",
+        api_key: Optional[str] = None,
+        num_gen_questions: int = 1,
+        prompt: str = ANSWER_RELEVANCY_PROMPT,
+    ):
+        self.model = model
+        self.embedder = embedder
+        self.api_key = api_key
+        self.num_gen_questions = num_gen_questions
+        self.prompt = prompt
+
+
+class ContextRelevanceConfig(BaseConfig):
+    def __init__(
+        self,
+        model: str = "gpt-4",
+        api_key: Optional[str] = None,
+        language: str = "en",
+        prompt: str = CONTEXT_RELEVANCY_PROMPT,
+    ):
+        self.model = model
+        self.api_key = api_key
+        self.language = language
+        self.prompt = prompt