[Community]add option to delete the prompt from HF output (#22225)

This will help to solve pattern mismatching issue when parsing the
output in Agent.

https://github.com/langchain-ai/langchain/issues/21912

libs/partners/huggingface/langchain_huggingface/llms/huggingface_pipeline.py

@@ -261,6 +261,7 @@ class HuggingFacePipeline(BaseLLM):
         # List to hold all results
         text_generations: List[str] = []
         pipeline_kwargs = kwargs.get("pipeline_kwargs", {})
+        skip_prompt = kwargs.get("skip_prompt", False)
 
         for i in range(0, len(prompts), self.batch_size):
             batch_prompts = prompts[i : i + self.batch_size]
@@ -290,7 +291,8 @@ class HuggingFacePipeline(BaseLLM):
                         f"Got invalid task {self.pipeline.task}, "
                         f"currently only {VALID_TASKS} are supported"
                     )
-
+                if skip_prompt:
+                    text = text[len(batch_prompts[j]) :]
                 # Append the processed text to results
                 text_generations.append(text)