grok lock in

training.py

@@ -4,23 +4,21 @@
 import os
 import json
 import math
-import time
 import numpy as np
 import pandas as pd
-
 import torch
 import torch.nn as nn
 import torch.nn.functional as F
 import torch.optim as optim
-
 from torch.utils.data import Dataset, DataLoader
 from sklearn.model_selection import train_test_split
-from sklearn.preprocessing import LabelEncoder
+from sklearn.preprocessing import StandardScaler
 from multiprocessing import Pool, cpu_count
 from functools import partial
+from tqdm import tqdm
 
 # ===============================
-# GPU SETUP
+# DEVICE
 # ===============================
 device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
 print(f"Using device: {device}")
@@ -29,7 +27,7 @@ if device.type == "cuda":
     torch.backends.cudnn.benchmark = True
 
 # ===============================
-# DATA LOADING & FEATURE EXTRACTION
+# DATA LOADING
 # ===============================
 def load_kaggle_asl_data(base_path):
     train_df = pd.read_csv(os.path.join(base_path, "train.csv"))
@@ -38,19 +36,12 @@ def load_kaggle_asl_data(base_path):
     return train_df, sign_to_idx
 
 def extract_hand_landmarks_from_parquet(path):
+    try:
         df = pd.read_parquet(path)
-    left = df[df["type"] == "left_hand"]
+        hand = df[df["type"].isin(["left_hand", "right_hand"])]
-    right = df[df["type"] == "right_hand"]
+        if len(hand) == 0:
-
-    hand = None
-    if len(left) > 0:
-        hand = left
-    elif len(right) > 0:
-        hand = right
-    else:
             return None
 
-    # Keep all frames
         frames = sorted(hand['frame'].unique())
         landmarks_seq = []
 
@@ -62,87 +53,100 @@ def extract_hand_landmarks_from_parquet(path):
                 if len(lm) == 0:
                     lm_list.append([0.0, 0.0, 0.0])
                 else:
-                lm_list.append([
+                    lm_list.append([lm['x'].values[0], lm['y'].values[0], lm['z'].values[0]])
-                    lm['x'].mean(),
-                    lm['y'].mean(),
-                    lm['z'].mean()
-                ])
             landmarks_seq.append(lm_list)
 
         return np.array(landmarks_seq, dtype=np.float32)  # (T, 21, 3)
-
+    except:
-def get_features_sequence(landmarks_seq, max_frames=100):
-    if landmarks_seq is None:
         return None
-    # Center on wrist
-    points = landmarks_seq - landmarks_seq[:, 0:1, :]
-    scale = np.linalg.norm(points[:, 9, :], axis=1, keepdims=True)
-    scale[scale < 1e-6] = 1.0
-    points /= scale[:, np.newaxis, :]
-    # Flatten per frame
-    frames = points.reshape(points.shape[0], -1)
-    # Pad or truncate
-    if frames.shape[0] < max_frames:
-        pad = np.zeros((max_frames - frames.shape[0], frames.shape[1]), dtype=np.float32)
-        frames = np.vstack([frames, pad])
-    else:
-        frames = frames[:max_frames]
-    return frames  # (max_frames, 63)
 
-def process_row(row, base_path, max_frames=100):
+def get_features_sequence(landmarks_seq, max_frames=96):
+    if landmarks_seq is None or len(landmarks_seq) == 0:
+        return None
+
+    # Center on wrist (landmark 0)
+    landmarks_seq = landmarks_seq - landmarks_seq[:, 0:1, :]
+
+    # Rough scale normalization (using index finger length as reference)
+    scale = np.linalg.norm(landmarks_seq[:, 8] - landmarks_seq[:, 5], axis=1, keepdims=True)
+    scale = np.maximum(scale, 1e-6)
+    landmarks_seq /= scale
+
+    # Flatten → (T, 63)
+    seq = landmarks_seq.reshape(landmarks_seq.shape[0], -1)
+
+    # Pad / truncate
+    if len(seq) < max_frames:
+        pad = np.zeros((max_frames - len(seq), seq.shape[1]), dtype=np.float32)
+        seq = np.concatenate([seq, pad], axis=0)
+    else:
+        seq = seq[:max_frames]
+
+    return seq.astype(np.float32)
+
+def process_row(row, base_path, max_frames=96):
     path = os.path.join(base_path, row['path'])
     if not os.path.exists(path):
         return None, None
-    try:
+    lm = extract_hand_landmarks_from_parquet(path)
-        lm_seq = extract_hand_landmarks_from_parquet(path)
+    feat = get_features_sequence(lm, max_frames)
-        feat_seq = get_features_sequence(lm_seq, max_frames)
+    if feat is None:
-        return feat_seq, row['sign']
-    except:
         return None, None
+    return feat, row['sign']
 
 # ===============================
-# LOAD + PROCESS DATA
+# LOAD & PROCESS (with progress)
 # ===============================
-base_path = "asl_kaggle"
+base_path = "asl_kaggle"  # ← change if needed
 train_df, sign_to_idx = load_kaggle_asl_data(base_path)
 
+print("Processing videos...")
 rows = [row for _, row in train_df.iterrows()]
-X, y = [], []
 
-func = partial(process_row, base_path=base_path, max_frames=100)
 with Pool(cpu_count()) as pool:
-    for feat_seq, sign in pool.map(func, rows):
+    results = list(tqdm(pool.imap(
-        if feat_seq is not None:
+        partial(process_row, base_path=base_path, max_frames=96),
-            X.append(feat_seq)
+        rows
+    ), total=len(rows)))
+
+X, y = [], []
+for feat, sign in results:
+    if feat is not None:
+        X.append(feat)
         y.append(sign)
 
 X = np.stack(X)  # (N, T, 63)
-y = np.array(y)
+print(f"Loaded {len(X)} valid samples  |  shape: {X.shape}")
-print("Samples:", len(X))
+
-print("Sequence shape:", X.shape[1:])
+# Global normalization (very important!)
+scaler = StandardScaler()
+X_reshaped = X.reshape(-1, X.shape[-1])
+X_reshaped = scaler.fit_transform(X_reshaped)
+X = X_reshaped.reshape(X.shape)
 
 # ===============================
-# LABEL ENCODING
+# LABELS
 # ===============================
+from sklearn.preprocessing import LabelEncoder
 le = LabelEncoder()
 y = le.fit_transform(y)
 num_classes = len(le.classes_)
-print("Num classes:", num_classes)
+print(f"Classes: {num_classes}")
 
 # ===============================
 # SPLIT
 # ===============================
 X_train, X_test, y_train, y_test = train_test_split(
-    X, y, test_size=0.2, stratify=y, random_state=42
+    X, y, test_size=0.15, stratify=y, random_state=42
 )
 
 # ===============================
-# DATASET
+# DATASET + DATALOADER
 # ===============================
 class ASLSequenceDataset(Dataset):
     def __init__(self, X, y):
-        self.X = torch.tensor(X, dtype=torch.float32)
+        self.X = torch.from_numpy(X).float()
-        self.y = torch.tensor(y, dtype=torch.long)
+        self.y = torch.from_numpy(y).long()
 
     def __len__(self):
         return len(self.X)
@@ -150,115 +154,158 @@ class ASLSequenceDataset(Dataset):
     def __getitem__(self, idx):
         return self.X[idx], self.y[idx]
 
-train_loader = DataLoader(ASLSequenceDataset(X_train, y_train), batch_size=64, shuffle=True, pin_memory=True)
+train_loader = DataLoader(ASLSequenceDataset(X_train, y_train),
-test_loader = DataLoader(ASLSequenceDataset(X_test, y_test), batch_size=64, shuffle=False, pin_memory=True)
+                          batch_size=64, shuffle=True, num_workers=4, pin_memory=True)
+test_loader  = DataLoader(ASLSequenceDataset(X_test, y_test),
+                          batch_size=96, shuffle=False, num_workers=4, pin_memory=True)
 
 # ===============================
-# TRANSFORMER MODEL
+# MODEL
 # ===============================
 class PositionalEncoding(nn.Module):
-    def __init__(self, d_model, max_len=100):
+    def __init__(self, d_model, max_len=128):
         super().__init__()
         pe = torch.zeros(max_len, d_model)
         position = torch.arange(0, max_len, dtype=torch.float).unsqueeze(1)
-        div_term = torch.exp(torch.arange(0, d_model, 2).float() * (-math.log(10000.0)/d_model))
+        div_term = torch.exp(torch.arange(0, d_model, 2).float() * (-math.log(10000.0) / d_model))
-        pe[:, 0::2] = torch.sin(position*div_term)
+        pe[:, 0::2] = torch.sin(position * div_term)
-        pe[:, 1::2] = torch.cos(position*div_term)
+        pe[:, 1::2] = torch.cos(position * div_term)
         self.register_buffer('pe', pe.unsqueeze(0))
 
     def forward(self, x):
-        return x + self.pe[:, :x.size(1), :]
+        return x + self.pe[:, :x.size(1)]
 
 class TransformerASL(nn.Module):
-    def __init__(self, input_dim, num_classes, d_model=256, nhead=8, num_layers=4):
+    def __init__(self, input_dim=63, num_classes=250, d_model=192, nhead=6, num_layers=4):
         super().__init__()
         self.proj = nn.Linear(input_dim, d_model)
-        self.norm = nn.LayerNorm(d_model)
+        self.norm_in = nn.LayerNorm(d_model)
+
         self.pos = PositionalEncoding(d_model)
 
-        encoder_layer = nn.TransformerEncoderLayer(d_model=d_model, nhead=nhead, dim_feedforward=1024,
+        encoder_layer = nn.TransformerEncoderLayer(
-                                                   dropout=0.1, activation='gelu', batch_first=True, norm_first=True)
+            d_model=d_model,
+            nhead=nhead,
+            dim_feedforward=d_model*4,
+            dropout=0.15,
+            activation='gelu',
+            batch_first=True,
+            norm_first=True
+        )
         self.encoder = nn.TransformerEncoder(encoder_layer, num_layers=num_layers)
 
-        self.fc = nn.Sequential(
+        self.head = nn.Sequential(
-            nn.Linear(d_model, 512),
+            nn.LayerNorm(d_model),
-            nn.BatchNorm1d(512),
+            nn.Dropout(0.25),
-            nn.GELU(),
+            nn.Linear(d_model, num_classes)
-            nn.Dropout(0.3),
-            nn.Linear(512, num_classes)
         )
 
-    def forward(self, x):
+    def forward(self, x, key_padding_mask=None):
         x = self.proj(x)
-        x = self.norm(x)
+        x = self.norm_in(x)
         x = self.pos(x)
-        x = self.encoder(x)           # (B, T, d_model)
+
-        x = x.mean(dim=1)             # temporal average
+        x = self.encoder(x, src_key_padding_mask=key_padding_mask)
-        x = self.fc(x)
+        x = x.mean(dim=1)           # global average pooling
+        x = self.head(x)
         return x
 
-model = TransformerASL(input_dim=X.shape[2], num_classes=num_classes).to(device)
+model = TransformerASL(input_dim=63, num_classes=num_classes).to(device)
-print("Parameters:", sum(p.numel() for p in model.parameters()))
+print(f"Model parameters: {sum(p.numel() for p in model.parameters()):,}")
 
 # ===============================
-# TRAIN SETUP
+# TRAINING SETUP
 # ===============================
-criterion = nn.CrossEntropyLoss(label_smoothing=0.1)
+criterion = nn.CrossEntropyLoss(label_smoothing=0.05)
-optimizer = optim.AdamW(model.parameters(), lr=3e-4, weight_decay=1e-4)
+optimizer = optim.AdamW(model.parameters(), lr=8e-4, weight_decay=1e-4, betas=(0.9, 0.98))
-scheduler = optim.lr_scheduler.CosineAnnealingWarmRestarts(optimizer, T_0=10)
+scheduler = optim.lr_scheduler.CosineAnnealingWarmRestarts(optimizer, T_0=15, T_mult=2)
 
 # ===============================
-# TRAIN / EVAL FUNCTIONS
+# TRAIN / EVAL
 # ===============================
+def create_padding_mask(seq_len, max_len):
+    # True = ignore this position
+    return torch.arange(max_len, device=device)[None, :] >= seq_len[:, None]
+
 def train_epoch():
     model.train()
-    total, correct, loss_sum = 0, 0, 0
+    total_loss = 0
-    for x, y in train_loader:
+    correct = 0
+    total = 0
+
+    for x, y in tqdm(train_loader, desc="Train"):
         x, y = x.to(device), y.to(device)
+
+        # Very simple length heuristic (can be improved later)
+        real_lengths = (x.abs().sum(dim=2) > 1e-6).sum(dim=1)
+        mask = create_padding_mask(real_lengths, x.size(1))
+
         optimizer.zero_grad(set_to_none=True)
-        logits = model(x)
+        logits = model(x, key_padding_mask=mask)
+
         loss = criterion(logits, y)
         loss.backward()
-        torch.nn.utils.clip_grad_norm_(model.parameters(), 1.0)
+
+        # STRONG clipping — very important for landmarks
+        grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(), max_norm=0.8)
+
         optimizer.step()
-        loss_sum += loss.item()
+
-        correct += (logits.argmax(1) == y).sum().item()
+        total_loss += loss.item()
+        correct += (logits.argmax(dim=-1) == y).sum().item()
         total += y.size(0)
-    return loss_sum/len(train_loader), 100*correct/total
+
+        # Debug exploding gradients
+        if torch.isnan(loss) or grad_norm > 50:
+            print(f"WARNING - NaN or huge grad! norm={grad_norm:.2f}")
+
+    return total_loss / len(train_loader), correct / total * 100
 
 @torch.no_grad()
 def evaluate():
     model.eval()
-    total, correct = 0, 0
+    correct = 0
+    total = 0
     for x, y in test_loader:
         x, y = x.to(device), y.to(device)
-        logits = model(x)
+        real_lengths = (x.abs().sum(dim=2) > 1e-6).sum(dim=1)
-        correct += (logits.argmax(1) == y).sum().item()
+        mask = create_padding_mask(real_lengths, x.size(1))
+
+        logits = model(x, key_padding_mask=mask)
+        correct += (logits.argmax(dim=-1) == y).sum().item()
         total += y.size(0)
-    return 100*correct/total
+    return correct / total * 100
 
 # ===============================
-# TRAIN LOOP
+# TRAINING LOOP
 # ===============================
 best_acc = 0
-patience = 15
+patience = 18
 wait = 0
-epochs = 50
+epochs = 80
 
 for epoch in range(epochs):
     loss, train_acc = train_epoch()
     test_acc = evaluate()
+
+    print(f"[{epoch+1:2d}/{epochs}]  loss: {loss:.4f}  |  train: {train_acc:.2f}%  |  test: {test_acc:.2f}%")
+
     scheduler.step()
-    print(f"Epoch {epoch+1}/{epochs} | Loss {loss:.4f} | Train {train_acc:.2f}% | Test {test_acc:.2f}%")
 
     if test_acc > best_acc:
         best_acc = test_acc
         wait = 0
-        torch.save({"model": model.state_dict(), "label_encoder": le}, "asl_transformer_full.pth")
+        torch.save({
+            'model': model.state_dict(),
+            'optimizer': optimizer.state_dict(),
+            'scaler': scaler,
+            'label_encoder_classes': le.classes_
+        }, "best_asl_transformer.pth")
+        print("→ Saved new best model")
     else:
         wait += 1
         if wait >= patience:
-            print("Early stopping")
+            print("Early stopping triggered")
             break
 
-print("Best accuracy:", best_acc)
+print(f"\nBest test accuracy achieved: {best_acc:.2f}%")