Feature/amazon nova

[jean-farmer]

Description

This PR adds integration for the newly released Nova models in Bedrock. These models support both images and video as inputs.

Image Sample Code

from langchain_aws import ChatBedrock
from langchain_core.messages import HumanMessage

image_path = "media/sunset.png"

llm = ChatBedrock(
    model="us.amazon.nova-lite-v1:0",
    temperature=0.7
)

with open(image_path, "rb") as image_file:
    binary_data = image_file.read()

message = HumanMessage(
    content=[
        {"image": {"format": "png", "source": {"bytes": binary_data}}},
        {"text": "Provide a summary of this photo"},
    ]
)

response = llm.invoke([message])

Video Sample Code

from langchain_aws import ChatBedrock

video_path = "media/cooking-quesadilla.mp4"

llm = ChatBedrock(
    model="us.amazon.nova-lite-v1:0",
    temperature=0.7
)

with open(video_path, "rb") as video_file:
    binary_data = video_file.read()


message = HumanMessage(
    content=[
        {"video": {"format": "mp4", "source": {"bytes": binary_data}}},
        {"type": "text", "text": "Describe the following video"},
    ]
)

response = llm.invoke([message])

Tool Call Sample

from langchain_aws import ChatBedrock
from langchain.tools import tool

@tool
def multiply(a: int, b: int) -> int:
    """Multiply two numbers."""
    return a * b

tools = [multiply]

llm_with_tools = ChatBedrock(
    model="us.amazon.nova-lite-v1:0",
    temperature=1,
    top_p=1,
    model_kwargs={
        "additional_model_request_fields": {
            "inferenceConfig": {
                "topK": 1
            }
        }
    },
).bind_tools(tools)

response = llm_with_tools.invoke([("user", "What is 8*8")])

Note: To get the best results with the Nova models when used in agent, structured or tool calls, use these values for temperature=1, top_p=1 and topK=1 as specified in the samples.

---

Image and Video used in sample code

https://github.com/user-attachments/assets/cf803340-18cf-444b-b72b-0e2866c6ce58

[3coins]

@jean-farmer
Thanks for submitting this change. Some minor comments, looks good otherwise.

[3coins]

@jean-farmer
Code looks good 🚀. Checking, if we can add the access to Nova models in the CI account, otherwise will skip the integration tests and merge.