Add detailed training script and documentation for FSD50K Part 4

model_checkpoints/Primitive_Extractor/FSD50k/training_script_part4.md

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+# WindOneSound 300M: FSD50K Part 4 Training
+
+## Overview
+This script fine-tunes the existing Part 3 Primitive Extractor checkpoint on the newly processed FSD50K Part 4 dataset. The goal is to continue expanding the model's acoustic knowledge base and improve its generalization without catastrophic forgetting of previously learned environmental sounds.
+
+## Methodology & Configuration
+- **Base Checkpoint:** `best_fsd50k_part3.pt`
+- **Dataset:** FSD50K Part 4 (7,379 training samples, 815 validation samples)
+- **Dual-Loss Objective:** 
+  - **Weighted BCE Loss:** Handles multi-label classification with dynamically calculated class weights to balance rare and common sounds.
+  - **MSE Reconstruction Loss:** Forces the model to rebuild the input BEATs features from the primitives, preserving the acoustic feature space and preventing representation collapse.
+  - **Total Loss:** `BCE_Loss + (0.1 * MSE_Loss)`
+- **Optimizer & Scheduler:** AdamW (lr=2e-4, weight_decay=1e-4) with a 10% Linear Warmup followed by Cosine Annealing decay.
+- **Epochs:** 10
+- **Mobile Optimization:** Harmless PyTorch warnings are suppressed at runtime. The training loop outputs a clean, structured table after each epoch to prevent scrolling spam on mobile devices.
+
+## Training Script
+
+```python
+import os
+import warnings
+import torch
+import torch.nn as nn
+import torch.optim as optim
+import pandas as pd
+import numpy as np
+import getpass
+import zipfile
+from tqdm.auto import tqdm
+from sklearn.metrics import average_precision_score
+from huggingface_hub import HfApi, hf_hub_download
+
+# ==========================================
+# 1. SUPPRESS HARMLESS PYTORCH WARNINGS
+# ==========================================
+warnings.filterwarnings("ignore", category=FutureWarning)
+warnings.filterwarnings("ignore", category=UserWarning)
+
+# ==========================================
+# 2. AUTHENTICATION & SETUP
+# ==========================================
+HF_TOKEN = getpass.getpass("Enter your Hugging Face API token (hidden): ")
+api = HfApi(token=HF_TOKEN)
+repo_id = "Hitelcy/WindoneRepo2"
+work_dir = "/content/training_part4"
+os.makedirs(work_dir, exist_ok=True)
+
+print("\n⬇️ Downloading Part 4 assets and Part 3 checkpoint...")
+
+# Download Part 4 Features Zip
+zip_path = hf_hub_download(
+    repo_id=repo_id, repo_type="dataset",
+    filename="datasets/FSD50K/part4_beats_features.zip",
+    local_dir=work_dir, token=HF_TOKEN
+)
+
+# Download Labels
+dev_csv = hf_hub_download(
+    repo_id=repo_id, repo_type="dataset",
+    filename="datasets/FSD50K/labels/ground_truth/dev.csv",
+    local_dir=work_dir, token=HF_TOKEN
+)
+vocab_csv = hf_hub_download(
+    repo_id=repo_id, repo_type="dataset",
+    filename="datasets/FSD50K/labels/ground_truth/vocabulary.csv",
+    local_dir=work_dir, token=HF_TOKEN
+)
+
+# Download the Part 3 Checkpoint
+ckpt_path = hf_hub_download(
+    repo_id=repo_id, repo_type="dataset",
+    filename="model_checkpoints/Primitive_Extractor/FSD50k/best_fsd50k_part3.pt",
+    local_dir=work_dir, token=HF_TOKEN
+)
+
+print("📦 Unzipping Part 4 features...")
+with zipfile.ZipFile(zip_path, 'r') as zip_ref:
+    zip_ref.extractall(work_dir)
+features_dir = work_dir 
+
+# ==========================================
+# 3. MATCH FEATURES TO LABELS
+# ==========================================
+print("🏷️ Processing Labels & Matching Part 4...")
+dev_df = pd.read_csv(dev_csv)
+vocab_df = pd.read_csv(vocab_csv)
+
+class_names = vocab_df.iloc[:, 1].tolist()
+class_to_idx = {name: idx for idx, name in enumerate(class_names)}
+num_classes = len(class_to_idx)
+
+pt_files_set = set(f.replace('.pt', '') for f in os.listdir(features_dir) if f.endswith('.pt'))
+
+train_set = []
+val_set = []
+
+print("🔗 Matching Part 4 files to ground truth...")
+for _, row in tqdm(dev_df.iterrows(), total=len(dev_df), desc="Matching", leave=False):
+    fname = str(row['fname'])
+    if fname in pt_files_set:
+        labels = str(row['labels']).split(',')
+        targets = torch.zeros(num_classes)
+        for lbl in labels:
+            if lbl in class_to_idx:
+                targets[class_to_idx[lbl]] = 1.0
+        
+        item = {'file': os.path.join(features_dir, f"{fname}.pt"), 'target': targets}
+        if row['split'] == 'train':
+            train_set.append(item)
+        elif row['split'] == 'val':
+            val_set.append(item)
+
+print(f"✅ Matched {len(train_set)} training and {len(val_set)} validation samples.\n")
+
+# Calculate Class Weights for Weighted BCE
+all_targets = torch.stack([d['target'] for d in train_set])
+pos_counts = all_targets.sum(dim=0)
+neg_counts = len(train_set) - pos_counts
+weights = (neg_counts / (pos_counts + 1e-5)).clamp(max=50.0)
+
+# ==========================================
+# 4. DEFINE & LOAD MODEL
+# ==========================================
+class ConvNormGELU(nn.Module):
+    def __init__(self, in_channels, out_channels, kernel_size, padding):
+        super().__init__()
+        self.conv = nn.Conv1d(in_channels, out_channels, kernel_size, padding=padding)
+        self.norm = nn.LayerNorm(out_channels)
+        self.act = nn.GELU()
+    def forward(self, x):
+        x = self.conv(x)
+        x = x.transpose(1, 2)
+        x = self.norm(x)
+        x = x.transpose(1, 2)
+        return self.act(x)
+
+class PrimitiveExtractor(nn.Module):
+    def __init__(self, input_dim=768, hidden_dim=512, num_classes=200):
+        super().__init__()
+        self.conv_stack = nn.Sequential(
+            ConvNormGELU(input_dim, 1728, 7, 3),
+            ConvNormGELU(1728, 1728, 5, 2),
+            ConvNormGELU(1728, 1728, 3, 1)
+        )
+        self.proj = nn.Sequential(nn.Linear(1728, hidden_dim), nn.LayerNorm(hidden_dim))
+        self.attn = nn.MultiheadAttention(hidden_dim, num_heads=8, batch_first=True)
+        self.norm = nn.LayerNorm(hidden_dim)
+        self.decoder = nn.Sequential(nn.Linear(hidden_dim, 1024), nn.GELU(), nn.Linear(1024, input_dim))
+        self.classifier = nn.Sequential(nn.Linear(hidden_dim, hidden_dim), nn.GELU(), nn.Dropout(0.2), nn.Linear(hidden_dim, num_classes))
+
+    def forward(self, x):
+        x_conv = x.transpose(1, 2)
+        features = self.conv_stack(x_conv).transpose(1, 2)
+        features = self.proj(features)
+        attn_out, _ = self.attn(features, features, features)
+        primitives = self.norm(features + attn_out)
+        
+        reconstruction_output = self.decoder(primitives)
+        pooled = primitives.mean(dim=1)
+        logits = self.classifier(pooled)
+        
+        return reconstruction_output, logits
+
+device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+
+print("\n🧠 Loading Part 3 Checkpoint...")
+state_dict = torch.load(ckpt_path, map_location=device)
+actual_num_classes = state_dict['classifier.3.weight'].shape[0] 
+model = PrimitiveExtractor(input_dim=768, hidden_dim=512, num_classes=actual_num_classes).to(device)
+model.load_state_dict(state_dict)
+print(f"✅ Model loaded successfully ({actual_num_classes} classes).")
+
+# ==========================================
+# 5. TRAINING SETUP (DUAL LOSS + WARMUP)
+# ==========================================
+epochs = 10
+alpha = 0.1
+batch_size = 16
+
+optimizer = optim.AdamW(model.parameters(), lr=2e-4, weight_decay=1e-4)
+
+steps_per_epoch = int(np.ceil(len(train_set) / batch_size))
+total_steps = steps_per_epoch * epochs
+warmup_steps = int(total_steps * 0.1)
+
+def lr_lambda(step):
+    if step < warmup_steps:
+        return float(step) / float(max(1, warmup_steps))
+    return 0.5 * (1 + np.cos(np.pi * (step - warmup_steps) / (total_steps - warmup_steps)))
+
+scheduler = optim.lr_scheduler.LambdaLR(optimizer, lr_lambda)
+bce_loss_fn = nn.BCEWithLogitsLoss(pos_weight=weights.to(device))
+mse_loss_fn = nn.MSELoss()
+
+best_val_map = 0.0
+global_step = 0
+
+# ==========================================
+# 6. TRAINING LOOP (MOBILE OPTIMIZED)
+# ==========================================
+print(f"\n{'='*65}")
+print(f" STARTING TRAINING: {epochs} Epochs | Target Metric: Val mAP")
+print(f"{'='*65}")
+
+for epoch in range(1, epochs + 1):
+    model.train()
+    epoch_bce = 0.0
+    epoch_mse = 0.0
+    
+    np.random.shuffle(train_set)
+    
+    pbar = tqdm(range(0, len(train_set), batch_size), desc=f"Epoch {epoch}/{epochs}", leave=False, ncols=80)
+    for i in pbar:
+        batch = train_set[i:i+batch_size]
+        optimizer.zero_grad()
+        
+        batch_bce = 0.0
+        batch_mse = 0.0
+        
+        for item in batch:
+            x = torch.load(item['file'], map_location=device).unsqueeze(0)
+            y = item['target'].unsqueeze(0).to(device)
+            
+            recon_out, logits = model(x)
+            
+            loss_bce = bce_loss_fn(logits, y)
+            loss_mse = mse_loss_fn(recon_out, x)
+            loss = loss_bce + (alpha * loss_mse)
+            
+            loss.backward()
+            
+            batch_bce += loss_bce.item()
+            batch_mse += loss_mse.item()
+            
+        optimizer.step()
+        scheduler.step()
+        global_step += 1
+        
+        epoch_bce += batch_bce / len(batch)
+        epoch_mse += batch_mse / len(batch)
+        pbar.set_postfix({'LR': f"{scheduler.get_last_lr()[0]:.2e}"})
+    pbar.close()
+
+    model.eval()
+    all_preds = []
+    all_targets = []
+    with torch.no_grad():
+        for item in val_set:
+            x = torch.load(item['file'], map_location=device).unsqueeze(0)
+            y = item['target']
+            _, logits = model(x)
+            preds = torch.sigmoid(logits).cpu().squeeze()
+            all_preds.append(preds.numpy())
+            all_targets.append(y.numpy())
+            
+    val_map = average_precision_score(np.array(all_targets), np.array(all_preds), average='macro')
+    
+    print(f"\n{'='*65}")
+    print(f"  Epoch  |  BCE Loss  |  MSE Loss  |  Val mAP   |    LR    ")
+    print(f"{'-'*65}")
+    print(f"   {epoch:02d}    |   {epoch_bce/steps_per_epoch:.4f}   |   {epoch_mse/steps_per_epoch:.4f}   |   {val_map:.4f}   | {scheduler.get_last_lr()[0]:.2e}")
+    print(f"{'='*65}")
+    
+    if val_map > best_val_map:
+        best_val_map = val_map
+        save_path = "/content/best_fsd50k_primitive_part1_to_4.pt"
+        torch.save(model.state_dict(), save_path)
+        print(f"  🏆 NEW BEST! Checkpoint saved (mAP: {best_val_map:.4f})\n")
+    else:
+        print(f"  (Best mAP remains: {best_val_map:.4f})\n")
+
+print(f"{'='*65}")
+print(f" 🎉 TRAINING COMPLETE!")
+print(f" 💾 Best model saved at: /content/best_fsd50k_primitive_part1_to_4.pt")
+print(f"{'='*65}")
+```
+
+---
+**Date:** Wednesday, 8th of October