OpenVINO™ is an open-source toolkit for optimizing and deploying AI inference. OpenVINO™ Runtime can enable running the same model optimized across various hardware devices. Accelerate your deep learning performance across use cases like: language + LLMs, computer vision, automatic speech recognition, and more. OpenVINO models can be run locally through the HuggingFacePipeline class. To deploy a model with OpenVINO, you can specify the backend="openvino" parameter to trigger OpenVINO as backend inference framework. To use, you should have the optimum-intel with OpenVINO Accelerator python package installed. 
%pip install -U-strategy eager "optimum[openvino,nncf]" langchain-huggingface --quiet

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Model Loading

Models can be loaded by specifying the model parameters using the from_model_id method. If you have an Intel GPU, you can specify model_kwargs={"device": "GPU"} to run inference on it. 
from langchain_huggingface import HuggingFacePipeline

ov_config = {"PERFORMANCE_HINT": "LATENCY", "NUM_STREAMS": "1", "CACHE_DIR": ""}

ov_llm = HuggingFacePipeline.from_model_id(
    model_id="gpt2",
    task="text-generation",
    backend="openvino",
    model_kwargs={"device": "CPU", "ov_config": ov_config},
    pipeline_kwargs={"max_new_tokens": 10},
)
They can also be loaded by passing in an existing optimum-intel pipeline directly 
from optimum.intel.openvino import OVModelForCausalLM
from transformers import AutoTokenizer, pipeline

model_id = "gpt2"
device = "CPU"
tokenizer = AutoTokenizer.from_pretrained(model_id)
ov_model = OVModelForCausalLM.from_pretrained(
    model_id, export=True, device=device, ov_config=ov_config
)
ov_pipe = pipeline(
    "text-generation", model=ov_model, tokenizer=tokenizer, max_new_tokens=10
)
ov_llm = HuggingFacePipeline(pipeline=ov_pipe)

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Create Chain

With the model loaded into memory, you can compose it with a prompt to form a chain. 
from langchain_core.prompts import PromptTemplate

template = """Question: {question}

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

chain = prompt | ov_llm

question = "What is electroencephalography?"

print(chain.invoke({"question": question}))
To get response without prompt, you can bind skip_prompt=True with LLM. 
chain = prompt | ov_llm.bind(skip_prompt=True)

question = "What is electroencephalography?"

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

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Inference with local OpenVINO model

It is possible to export your model to the OpenVINO IR format with the CLI, and load the model from local folder. 
!optimum-cli export openvino --model gpt2 ov_model_dir
It is recommended to apply 8 or 4-bit weight quantization to reduce inference latency and model footprint using --weight-format: 
!optimum-cli export openvino --model gpt2  --weight-format int8 ov_model_dir # for 8-bit quantization

!optimum-cli export openvino --model gpt2  --weight-format int4 ov_model_dir # for 4-bit quantization

ov_llm = HuggingFacePipeline.from_model_id(
    model_id="ov_model_dir",
    task="text-generation",
    backend="openvino",
    model_kwargs={"device": "CPU", "ov_config": ov_config},
    pipeline_kwargs={"max_new_tokens": 10},
)

chain = prompt | ov_llm

question = "What is electroencephalography?"

print(chain.invoke({"question": question}))
You can get additional inference speed improvement with Dynamic Quantization of activations and KV-cache quantization. These options can be enabled with ov_config as follows: 
ov_config = {
    "KV_CACHE_PRECISION": "u8",
    "DYNAMIC_QUANTIZATION_GROUP_SIZE": "32",
    "PERFORMANCE_HINT": "LATENCY",
    "NUM_STREAMS": "1",
    "CACHE_DIR": "",
}

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Streaming

You can use stream method to get a streaming of LLM output, 
generation_config = {"skip_prompt": True, "pipeline_kwargs": {"max_new_tokens": 100}}
chain = prompt | ov_llm.bind(**generation_config)

for chunk in chain.stream(question):
    print(chunk, end="", flush=True)
For more information refer to: