[Amazon Bedrock] Amazon Bedrock example to demonstrate the feature

[bilgeyucel]

Something along the lines of:

from amazon_bedrock_haystack import AmazonBedrockGenerator

aws_access_key_id="..."
aws_secret_access_key="..."
aws_region_name="eu-central-1"

generator = AmazonBedrockGenerator(model_name="anthropic.claude-v2",aws_access_key_id=aws_access_key_id,aws_secret_access_key=aws_secret_access_key,aws_region_name=aws_region_name)
result = generator.run("Who is the best American actor?")
for reply in result["replies"]:
    print(reply)

# >>> 'There is no definitive "best" American actor, as acting skill and talent a# re subjective. However, some of the most acclaimed and influential American act# ors include Tom Hanks, Daniel Day-Lewis, Denzel Washington, Meryl Streep, Rober# t De Niro, Al Pacino, Marlon Brando, Jack Nicholson, Leonardo DiCaprio and John# ny Depp. Choosing a single "best" actor comes down to personal preference.'

or in a pipeline:

from haystack.components.retrievers import InMemoryBM25Retriever
from haystack.components.builders import PromptBuilder
from haystack.document_stores.in_memory import InMemoryDocumentStore
from haystack import Pipeline

from amazon_bedrock_haystack import AmazonBedrockGenerator

template = """
Given the following information, answer the question.

Context: 
{% for document in documents %}
    {{ document.content }}
{% endfor %}

Question: What's the official language of {{ country }}?
"""

aws_access_key_id="..."
aws_secret_access_key="..."
aws_region_name="eu-central-1"
generator = AmazonBedrockGenerator(model_name="anthropic.claude-v2",aws_access_key_id=aws_access_key_id,aws_secret_access_key=aws_secret_access_key,aws_region_name=aws_region_name)
docstore = InMemoryDocumentStore()

pipe = Pipeline()
pipe.add_component("retriever", InMemoryBM25Retriever(document_store=docstore))
pipe.add_component("prompt_builder", PromptBuilder(template=template))
pipe.add_component("generator", generator)
pipe.connect("retriever", "prompt_builder.documents")
pipe.connect("prompt_builder", "generator")

pipe.run({
    "retriever":{ "query": "France"},
    "prompt_builder": {
        "country": "France"
    }
})

# {'generator': {'replies': ['Based on the context provided, the official language of France is French.']}}