app.py

import gradio as gr
import torch
import torch.nn as nn
from torch.utils.data import Dataset, DataLoader
from transformers import WhisperModel, WhisperFeatureExtractor
import datasets
from datasets import load_dataset, DatasetDict, Audio
from huggingface_hub import PyTorchModelHubMixin
import numpy as np
import librosa

# Ensure you have the device setup (cuda or cpu)
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")

# Define the config for your model
config = {"encoder": "openai/whisper-base", "num_labels": 2}

# Define data class
class SpeechInferenceDataset(Dataset):
    def __init__(self, audio_data, text_processor):
        self.audio_data = audio_data
        self.text_processor = text_processor

    def __len__(self):
        return len(self.audio_data)

    def __getitem__(self, index):
        inputs = self.text_processor(self.audio_data[index]["audio"]["array"],
                                     return_tensors="pt",
                                     sampling_rate=self.audio_data[index]["audio"]["sampling_rate"])
        input_features = inputs.input_features
        decoder_input_ids = torch.tensor([[1, 1]])  # Modify as per your model's requirements
        return input_features, decoder_input_ids

# Define model class
class SpeechClassifier(nn.Module, PyTorchModelHubMixin):
    def __init__(self, config):
        super(SpeechClassifier, self).__init__()
        self.encoder = WhisperModel.from_pretrained(config["encoder"])
        self.classifier = nn.Sequential(
            nn.Linear(self.encoder.config.hidden_size, 4096),
            nn.ReLU(),
            nn.Linear(4096, 2048),
            nn.ReLU(),
            nn.Linear(2048, 1024),
            nn.ReLU(),
            nn.Linear(1024, 512),
            nn.ReLU(),
            nn.Linear(512, config["num_labels"])
        )

    def forward(self, input_features, decoder_input_ids):
        outputs = self.encoder(input_features, decoder_input_ids=decoder_input_ids)
        pooled_output = outputs['last_hidden_state'][:, 0, :]
        logits = self.classifier(pooled_output)
        return logits

# Prepare data function
def prepare_data(audio_data, sampling_rate, model_checkpoint="openai/whisper-base"):
    
    # Resample audio data to 16000 Hz
    audio_data_resampled = librosa.resample(audio_data, orig_sr=sampling_rate, target_sr=16000)

    # Initialize the feature extractor
    feature_extractor = WhisperFeatureExtractor.from_pretrained(model_checkpoint)
    
    # Use Dataset class 
    dataset = SpeechInferenceDataset([{"audio": {"array": audio_data_resampled, "sampling_rate": 16000}}],
                                     text_processor=feature_extractor)
    
    return dataset


# Prediction function
def predict(audio_data, sampling_rate, config):
    input_features, decoder_input_ids = prepare_data(audio_data, sampling_rate, config["encoder"])

    model = SpeechClassifier(config).to(device)
    # Here we load the model from Hugging Face Hub
    model.load_state_dict(torch.hub.load_state_dict_from_url("https://huggingface.co/jcho02/whisper_cleft/resolve/main/pytorch_model.bin", map_location=device))

    model.eval()
    with torch.no_grad():
        logits = model(input_features, decoder_input_ids)
        predicted_ids = int(torch.argmax(logits, dim=-1))
    return predicted_ids

# Gradio Interface functions
def gradio_file_interface(uploaded_file):
    # Assuming the uploaded_file is a filepath (str)
    with open(uploaded_file, "rb") as f:
        audio_data = np.frombuffer(f.read(), np.int16)
    prediction = predict(audio_data, 16000, config)  # Assume 16kHz sample rate
    label = "Hypernasality Detected" if prediction == 1 else "No Hypernasality Detected"
    return label

def gradio_mic_interface(mic_input):
    # mic_input is a tuple with sample_rate and data as entries
    # (44100, array([   0,    0,    0, ..., -153, -140, -120], dtype=int16))
    prediction = predict(mic_input[1], mic_input[0], config)
    label = "Hypernasality Detected" if prediction == 1 else "No Hypernasality Detected"
    return label

# Define the interfaces inside the Blocks context
with gr.Blocks() as demo:
    # File Upload Tab
    with gr.Tab("Upload File"):
        gr.Interface(
            fn=gradio_file_interface,
            inputs=gr.Audio(sources="upload", type="filepath"),  # Use filepath for uploaded audio files
            outputs=gr.Textbox(label="Prediction")
        )

    # Mic Tab
    with gr.Tab("Record Using Microphone"):
        gr.Interface(
            fn=gradio_mic_interface,
            inputs=gr.Audio(sources="microphone", type="numpy"),  # Use numpy for real-time audio like microphone
            outputs=gr.Textbox(label="Prediction")
        )

# Launch the demo with debugging enabled
demo.launch(debug=True)