from fastapi import FastAPI
from transformers import pipeline
 
# Create a new FastAPI app instance
app = FastAPI(docs_url="/")
 
# Initialize text generation pipeline - to generate text given an input.
pipe  = pipeline(
    "text2text-generation", 
    model = "google/flan-t5-small"
)


# Endpoint route: GET request at `/generate`
@app.get("/generate")
def generate(text: str) -> dict:    
    """
    Using the text2text-generation pipeline from `transformers`, generate text
    from the given input text. The model used is `google/flan-t5-small`, which
    can be found [here](<https://huggingface.co/google/flan-t5-small>).

    generates text based on the # input using the pipeline() object
    returns a JSON response containing the gneerated text under the key 'output'
    """
    # Use the pipeline to generate text from the given input text
    output = pipe(text)
     
    # Return the generated text in a JSON response
    return {"output": output[0]["generated_text"]}