partners: Fixed the procedure of initializing pad_token_id

[tishizaki]

• Description: Add to check pad_token_id and eos_token_id of model config. It seems that this is the same bug as the HuggingFace TGI bug. It's same bug as community: Fixed the procedure of initializing pad_token_id #29434
• Issue: Llama-3.2-3B-Instruct failed to use with HuggingfacePipeline because of setting a non-string value as the pad_token #29431
• Dependencies: none
• Twitter handle: tell14

Example code is followings:

from langchain_huggingface.llms import HuggingFacePipeline

hf = HuggingFacePipeline.from_model_id(
    model_id="meta-llama/Llama-3.2-3B-Instruct",
    task="text-generation",
    pipeline_kwargs={"max_new_tokens": 10},
)

from langchain_core.prompts import PromptTemplate

template = """Question: {question}

Answer: Let's think step by step."""
prompt = PromptTemplate.from_template(template)

chain = prompt | hf

question = "What is electroencephalography?"

print(chain.invoke({"question": question}))

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