update speech file

src/train_speech.py

@@ -0,0 +1,169 @@
+import os
+import torch
+import torch.nn as nn
+import torch.optim as optim
+import soundfile as sf  
+import torchaudio
+import numpy as np
+from datasets import Dataset
+from transformers import Wav2Vec2Model, Wav2Vec2Processor
+from dotenv import load_dotenv
+from sklearn.metrics import accuracy_score
+
+# Charger .env pour Hugging Face API Key
+load_dotenv()
+HF_API_KEY = os.getenv("HF_API_KEY")
+
+if not HF_API_KEY:
+    raise ValueError("Le token Hugging Face n'a pas été trouvé dans .env")
+
+# Définition des labels pour la classification des émotions
+LABELS = {"colere": 0, "neutre": 1, "joie": 2}
+NUM_LABELS = len(LABELS)
+
+# Charger le processeur et le modèle pour l'extraction de features
+model_name = "facebook/wav2vec2-large-xlsr-53-french"
+device = "cuda" if torch.cuda.is_available() else "cpu"
+
+processor = Wav2Vec2Processor.from_pretrained(model_name)
+feature_extractor = Wav2Vec2Model.from_pretrained(model_name).to(device)
+
+# Resampleur pour convertir en 16 kHz
+resampler = torchaudio.transforms.Resample(orig_freq=48_000, new_freq=16_000)
+
+# Définition du classifieur amélioré
+class EmotionClassifier(nn.Module):
+    def __init__(self, feature_dim, num_labels):
+        super(EmotionClassifier, self).__init__()
+        self.fc1 = nn.Linear(feature_dim, 512)
+        self.relu = nn.ReLU()
+        self.dropout = nn.Dropout(0.3)
+        self.fc2 = nn.Linear(512, num_labels)
+
+    def forward(self, x):
+        x = self.fc1(x)
+        x = self.relu(x)
+        x = self.dropout(x)
+        return self.fc2(x)
+
+# Instancier le classifieur
+classifier = EmotionClassifier(feature_extractor.config.hidden_size, NUM_LABELS).to(device)
+
+# Charger les fichiers audio et leurs labels
+def load_audio_data(data_dir):
+    data = []
+    for label_name, label_id in LABELS.items():
+        label_dir = os.path.join(data_dir, label_name)
+        for file in os.listdir(label_dir):
+            if file.endswith(".wav"):
+                file_path = os.path.join(label_dir, file)
+                data.append({"path": file_path, "label": label_id})
+    return Dataset.from_list(data)
+
+# Chargement du dataset-------------------------------------------------------------------------------------
+data_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), "data"))
+ds = load_audio_data(data_dir)
+
+# Charger les fichiers audio avec SoundFile et rééchantillonner à 16 kHz
+def preprocess_audio(batch):
+    speech, sample_rate = sf.read(batch["path"], dtype="float32")
+
+    if sample_rate != 16000:
+        speech = torch.tensor(speech).unsqueeze(0)
+        speech = resampler(speech).squeeze(0).numpy()
+    
+    batch["speech"] = speech.tolist()  # Convertir en liste pour éviter les erreurs de PyArrow
+    batch["sampling_rate"] = 16000
+    return batch
+
+
+ds = ds.map(preprocess_audio)
+
+# Vérifier la distribution des longueurs des fichiers audio
+lengths = [len(sample["speech"]) for sample in ds]
+max_length = int(np.percentile(lengths, 95))
+
+# Transformer l'audio en features utilisables par le modèle
+def prepare_features(batch):
+    features = processor(
+        batch["speech"], 
+        sampling_rate=16000,  
+        padding=True,
+        truncation=True,
+        max_length=max_length,  
+        return_tensors="pt"
+    )
+    batch["input_values"] = features.input_values.squeeze(0)
+    batch["label"] = torch.tensor(batch["label"], dtype=torch.long)
+    return batch
+
+ds = ds.map(prepare_features)
+
+# Diviser les données en train et test
+ds = ds.train_test_split(test_size=0.2)
+train_ds = ds["train"]
+test_ds = ds["test"]
+
+# Fonction d'entraînement avec sauvegarde du meilleur modèle
+def train_classifier(feature_extractor, classifier, train_ds, test_ds, epochs=20, batch_size=8):
+    optimizer = optim.AdamW(classifier.parameters(), lr=2e-5, weight_decay=0.01)
+    loss_fn = nn.CrossEntropyLoss()
+
+    best_accuracy = 0.0  # Variable pour stocker la meilleure accuracy
+
+    for epoch in range(epochs):
+        classifier.train()
+        total_loss, correct = 0, 0
+        batch_count = 0
+
+        for i in range(0, len(train_ds), batch_size):
+            batch = train_ds[i: i + batch_size]
+            optimizer.zero_grad()
+
+            input_values = processor(
+                batch["speech"], 
+                sampling_rate=16000,  
+                return_tensors="pt", 
+                padding=True, 
+                truncation=True, 
+                max_length=max_length  
+            ).input_values.to(device)
+
+            with torch.no_grad():
+                features = feature_extractor(input_values).last_hidden_state.mean(dim=1)
+
+            logits = classifier(features)
+            labels = torch.tensor(batch["label"], dtype=torch.long, device=device)
+
+            if labels.numel() == 0:
+                continue
+
+            loss = loss_fn(logits, labels)
+
+            loss.backward()
+            optimizer.step()
+
+            total_loss += loss.item()
+            correct += (logits.argmax(dim=-1) == labels).sum().item()
+            batch_count += 1
+
+        train_acc = correct / len(train_ds)
+
+        # Sauvegarde du modèle seulement si la précision s'améliore
+        if train_acc > best_accuracy:
+            best_accuracy = train_acc
+            torch.save({
+                "classifier_state_dict": classifier.state_dict(),
+                "feature_extractor_state_dict": feature_extractor.state_dict(),
+                "processor": processor
+            }, "best_emotion_model.pth")
+            print(f"✅ Nouveau meilleur modèle sauvegardé ! Accuracy: {best_accuracy:.4f}")
+
+        print(f"Epoch {epoch+1}/{epochs} - Loss: {total_loss/batch_count:.4f} - Accuracy: {train_acc:.4f}")
+
+    return classifier
+
+# Entraînement
+trained_classifier = train_classifier(feature_extractor, classifier, train_ds, test_ds, epochs=20, batch_size=8)
+
+print("✅ Entraînement terminé, le meilleur modèle a été sauvegardé !")