import os import pandas as pd import numpy as np import matplotlib.pyplot as plt import seaborn as sns from sklearn.preprocessing import StandardScaler, LabelEncoder from sklearn.metrics import confusion_matrix, classification_report, accuracy_score, precision_score, recall_score, f1_score from tensorflow.keras.models import Model, Sequential from tensorflow.keras.layers import LSTM, Dense, Dropout, Input from tensorflow.keras.utils import to_categorical from tensorflow.keras.optimizers import Adam from tensorflow.keras.callbacks import ReduceLROnPlateau, EarlyStopping # Suppress TensorFlow GPU warnings os.environ['TF_CPP_MIN_LOG_LEVEL'] = '2' # Paths to the dataset files dataset_dir_path = r'C:\Users\LENOVO LEGION\Downloads\human+activity+recognition+using+smartphones\UCI HAR Dataset\UCI HAR Dataset' # Load and preprocess data def load_data(): # Load the feature labels features = pd.read_csv(os.path.join(dataset_dir_path, 'features.txt'), delim_whitespace=True, header=None, names=['index', 'feature']) # Load the activity labels activity_labels = pd.read_csv(os.path.join(dataset_dir_path, 'activity_labels.txt'), delim_whitespace=True, header=None, names=['index', 'activity']) # Load training data X_train = pd.read_csv(os.path.join(dataset_dir_path, 'train', 'X_train.txt'), delim_whitespace=True, header=None) y_train = pd.read_csv(os.path.join(dataset_dir_path, 'train', 'y_train.txt'), delim_whitespace=True, header=None, names=['activity']) # Load test data X_test = pd.read_csv(os.path.join(dataset_dir_path, 'test', 'X_test.txt'), delim_whitespace=True, header=None) y_test = pd.read_csv(os.path.join(dataset_dir_path, 'test', 'y_test.txt'), delim_whitespace=True, header=None, names=['activity']) # Label the columns X_train.columns = features['feature'] X_test.columns = features['feature'] # Normalize the feature data scaler = StandardScaler() X_train_scaled = scaler.fit_transform(X_train) X_test_scaled = scaler.transform(X_test) # Reshape the data for LSTM (samples, time steps, features) X_train_reshaped = X_train_scaled.reshape((X_train_scaled.shape[0], 1, X_train_scaled.shape[1])) X_test_reshaped = X_test_scaled.reshape((X_test_scaled.shape[0], 1, X_test_scaled.shape[1])) # Encode activity labels encoder = LabelEncoder() y_train_encoded = encoder.fit_transform(y_train['activity']) y_test_encoded = encoder.transform(y_test['activity']) # Convert to categorical y_train_categorical = to_categorical(y_train_encoded) y_test_categorical = to_categorical(y_test_encoded) return (X_train_reshaped, y_train_categorical, X_test_reshaped, y_test_categorical, activity_labels, X_train_scaled) # Load data print("Loading and preprocessing data...") X_train, y_train, X_test, y_test, activity_labels, X_train_scaled = load_data() print("Data loading completed.") print(f"Training data shape: {X_train.shape}") print(f"Test data shape: {X_test.shape}") print(f"Number of activities: {len(activity_labels)}") # Visualization functions def plot_training_history(history, title="Model Training History"): fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(15, 5)) # Accuracy plot ax1.plot(history.history['accuracy'], label='Training Accuracy') ax1.plot(history.history['val_accuracy'], label='Validation Accuracy') ax1.set_title(f'{title} - Accuracy') ax1.set_xlabel('Epoch') ax1.set_ylabel('Accuracy') ax1.legend() # Loss plot ax2.plot(history.history['loss'], label='Training Loss') ax2.plot(history.history['val_loss'], label='Validation Loss') ax2.set_title(f'{title} - Loss') ax2.set_xlabel('Epoch') ax2.set_ylabel('Loss') ax2.legend() plt.tight_layout() plt.savefig(f'training_history_{title.lower().replace(" ", "_")}.png') plt.close() def plot_confusion_matrix(y_true, y_pred, title="Confusion Matrix"): cm = confusion_matrix(y_true, y_pred) plt.figure(figsize=(10, 8)) sns.heatmap(cm, annot=True, fmt='d', cmap='Blues') plt.title(title) plt.ylabel('True label') plt.xlabel('Predicted label') # Set x and y axis labels using activity names tick_positions = np.arange(len(activity_labels)) + 0.5 plt.xticks(tick_positions, activity_labels['activity'], rotation=45, ha='right') plt.yticks(tick_positions, activity_labels['activity'], rotation=0) plt.tight_layout() plt.savefig(f'confusion_matrix_{title.lower().replace(" ", "_")}.png') plt.close() def plot_feature_importance(model, title="Feature Importance"): # Get the weights from the first dense layer weights = np.abs(model.layers[0].get_weights()[0]).mean(axis=0) # Create a dataframe of features and their importance feature_importance = pd.DataFrame({ 'feature': X_train.columns, 'importance': weights }).sort_values('importance', ascending=False) # Plot top 20 features plt.figure(figsize=(12, 6)) sns.barplot(data=feature_importance.head(20), x='importance', y='feature') plt.title(f'{title} - Top 20 Features') plt.tight_layout() plt.savefig(f'feature_importance_{title.lower().replace(" ", "_")}.png') plt.close() # Simple LSTM Model definition def simple_lstm(input_shape, num_classes): model = Sequential() model.add(LSTM(100, input_shape=input_shape, return_sequences=False)) model.add(Dropout(0.5)) model.add(Dense(num_classes, activation='softmax')) return model # Function to train and evaluate model def train_and_evaluate_model(model, X_train, y_train, X_test, y_test, model_name="Simple LSTM"): # Compile model model.compile(optimizer=Adam(learning_rate=0.001), loss='categorical_crossentropy', metrics=['accuracy']) # Define callbacks reduce_lr = ReduceLROnPlateau(monitor='val_loss', factor=0.2, patience=5, min_lr=0.00001) early_stopping = EarlyStopping(monitor='val_loss', patience=10, restore_best_weights=True) # Train model print(f"\nTraining {model_name}...") history = model.fit(X_train, y_train, epochs=20, batch_size=64, validation_split=0.2, verbose=1, callbacks=[reduce_lr, early_stopping]) # Evaluate model print(f"\nEvaluating {model_name}...") loss, accuracy = model.evaluate(X_test, y_test, verbose=0) # Make predictions y_pred = model.predict(X_test) y_pred_classes = np.argmax(y_pred, axis=1) y_true = np.argmax(y_test, axis=1) # Calculate metrics precision = precision_score(y_true, y_pred_classes, average='weighted') recall = recall_score(y_true, y_pred_classes, average='weighted') f1 = f1_score(y_true, y_pred_classes, average='weighted') # Print results print(f'\n{model_name} Results:') print(f'Test Accuracy: {accuracy*100:.2f}%') print(f'Test Loss: {loss:.4f}') print(f'Precision: {precision:.4f}') print(f'Recall: {recall:.4f}') print(f'F1 Score: {f1:.4f}') return history, accuracy, precision, recall, f1, y_true, y_pred_classes def save_model_results(model_name, history, accuracy, precision, recall, f1, y_true, y_pred_classes): # Save results to file with open(f'{model_name.lower().replace(" ", "_")}_results.txt', 'w') as f: f.write(f"{model_name} Results\n") f.write("="*50 + "\n\n") f.write("Model Performance Metrics:\n") f.write(f"Test Accuracy: {accuracy*100:.2f}%\n") f.write(f"Precision: {precision:.4f}\n") f.write(f"Recall: {recall:.4f}\n") f.write(f"F1 Score: {f1:.4f}\n\n") f.write("Classification Report:\n") f.write(classification_report(y_true, y_pred_classes, target_names=activity_labels['activity'])) f.write("\nTraining History:\n") f.write("Epoch\tLoss\tAccuracy\tVal_Loss\tVal_Accuracy\n") for i in range(len(history.history['loss'])): f.write(f"{i+1}\t{history.history['loss'][i]:.4f}\t") f.write(f"{history.history['accuracy'][i]:.4f}\t") f.write(f"{history.history['val_loss'][i]:.4f}\t") f.write(f"{history.history['val_accuracy'][i]:.4f}\n") def plot_model_metrics(history, accuracy, precision, recall, f1, model_name="Simple LSTM"): # Plot training history plot_training_history(history, model_name) # Plot metrics comparison plt.figure(figsize=(10, 6)) metrics = ['Accuracy', 'Precision', 'Recall', 'F1 Score'] values = [accuracy, precision, recall, f1] plt.bar(metrics, values) plt.title(f'{model_name} - Performance Metrics') plt.ylim([0, 1]) # Add value labels on top of each bar for i, v in enumerate(values): plt.text(i, v + 0.01, f'{v:.4f}', ha='center') plt.tight_layout() plt.savefig(f'metrics_comparison_{model_name.lower().replace(" ", "_")}.png') plt.close() def plot_loss_convergence(history, model_name="Simple LSTM"): plt.figure(figsize=(10, 6)) plt.plot(history.history['loss'], label='Training Loss') plt.plot(history.history['val_loss'], label='Validation Loss') plt.title(f'{model_name} - Loss Convergence') plt.xlabel('Epoch') plt.ylabel('Loss') plt.legend() plt.grid(True) plt.tight_layout() plt.savefig(f'loss_convergence_{model_name.lower().replace(" ", "_")}.png') plt.close() # Main execution if __name__ == "__main__": print("UCI HAR Dataset - Simple LSTM Implementation") print("="*50) # Create and train model input_shape = (X_train.shape[1], X_train.shape[2]) num_classes = y_train.shape[1] model = simple_lstm(input_shape, num_classes) # Print model summary print("\nModel Architecture:") model.summary() # Train and evaluate history, accuracy, precision, recall, f1, y_true, y_pred_classes = train_and_evaluate_model( model, X_train, y_train, X_test, y_test, "Simple LSTM" ) # Generate visualizations plot_model_metrics(history, accuracy, precision, recall, f1) plot_confusion_matrix(y_true, y_pred_classes, "Simple LSTM") plot_feature_importance(model, "Simple LSTM") plot_loss_convergence(history) # Save results save_model_results("Simple LSTM", history, accuracy, precision, recall, f1, y_true, y_pred_classes) # Save model model.save('simple_lstm_uci_har.h5') print("\nAnalysis complete. All results and visualizations have been saved.")