app.py

import os

import gradio as gr
import torch
import numpy as np
import librosa

from efficientat.models.MobileNetV3 import get_model as get_mobilenet, get_ensemble_model
from efficientat.models.preprocess import AugmentMelSTFT
from efficientat.helpers.utils import NAME_TO_WIDTH, labels

from torch import autocast
from contextlib import nullcontext

from langchain import OpenAI, ConversationChain, LLMChain, PromptTemplate
from langchain.chains.conversation.memory import ConversationalBufferWindowMemory

MODEL_NAME = "mn40_as"

device = torch.device('cuda') if torch.cuda.is_available() else torch.device('cpu')
model = get_mobilenet(width_mult=NAME_TO_WIDTH(MODEL_NAME), pretrained_name=MODEL_NAME)
model.to(device)
model.eval()    


def audio_tag(
    audio_path,
    sample_rate=32000,
    window_size=800,
    hop_size=320,
    n_mels=128,
    cuda=True,
):

    (waveform, _) = librosa.core.load(audio_path, sr=sample_rate, mono=True)
    mel = AugmentMelSTFT(n_mels=n_mels, sr=sample_rate, win_length=window_size, hopsize=hop_size)
    mel.to(device)
    mel.eval()
    waveform = torch.from_numpy(waveform[None, :]).to(device)
    
    # our models are trained in half precision mode (torch.float16)
    # run on cuda with torch.float16 to get the best performance
    # running on cpu with torch.float32 gives similar performance, using torch.bfloat16 is worse
    with torch.no_grad(), autocast(device_type=device.type) if cuda and torch.cuda.is_available() else nullcontext():
        spec = mel(waveform)
        preds, features = model(spec.unsqueeze(0))
    preds = torch.sigmoid(preds.float()).squeeze().cpu().numpy()

    sorted_indexes = np.argsort(preds)[::-1]
    output = {}
    # Print audio tagging top probabilities

    label = labels[sorted_indexes[0]]
    return formatted_message(label)


cached_audio_class = None 
template = None
prompt = None
chain = None

def format_classname(classname):
  return classname.capitalize()
    
def formatted_message(audio_class):
    formatted_classname = format_classname(audio_class)
    if cached_audio_class != formatted_classname:
        
        cached_audio_class = formatted_classname
    
        prefix = f"""You are going to act as a magical tool that allows for humans to communicate with non-human entities like rocks, crackling fire, trees, animals, and the wind. In order to do this, we're going to provide you the human's text input for the conversation. The goal is for you to embody that non-human entity and converse with the human.

Examples:

Non-human Entity: Tree

Human Input: Hello tree
Tree: Hello human, I am a tree

Let's begin:
Non-human Entity: {formatted_classname}"""
        suffix = f'''
{{history}}
Human Input: {{human_input}}
{formatted_classname}:'''
        template = prefix + suffix

        prompt = PromptTemplate(
            input_variables=["history", "human_input"], 
            template=template
        )

        chatgpt_chain = LLMChain(
            llm=OpenAI(temperature=.5, openai_api_key=session_token), 
            prompt=prompt, 
            verbose=True, 
            memory=ConversationalBufferWindowMemory(k=2, ai=formatted_classname),
        )

    output = chatgpt_chain.predict(human_input=message)

    return output


demo = gr.Interface(
    audio_tag,
    gr.Audio(source="upload", type="filepath", label="Your audio"),
    gr.Textbox(),
    examples=[["metro_station-paris.wav"]]
).launch(debug=True)