from sklearn.model_selection import train_test_split from keras.utils import to_categorical from keras.models import Sequential from keras.layers import LSTM, Dense from keras.callbacks import TensorBoard label_map = {label:num for num, label in enumerate(actions)} sequences, labels = [], [] for action in actions: for sequence in range(no_sequences): window = [] for frame_num in range(sequence_length): res = np.load(os.path.join(DATA_PATH, action, str(sequence), "{}.npy".format(frame_num)))`ERROR` window.append(res)`your text` sequences.append(window) labels.append(label_map[action]) Error occurs in the line np.load() method while loading .npy array. Continue reading...