When fitting a CNN model, every second Epoch takes zero seconds and with OUT_OF_RANGE warnings. Im using structured folders of categorical images for training and validation. Here is the warning message that occurs after every second Epoch. The fitting looks like this... 37/37 ━━━━━━━━━━━━━━━━━━━━ 14s 337ms/step - accuracy: 0.5255 - loss: 1.0819 - val_accuracy: 0.2578 - val_loss: 2.4472 Epoch 4/20 37/37 ━━━━━━━━━━━━━━━━━━━━ 0s 1ms/step - accuracy: 0.5312 - loss: 1.1106 - val_accuracy: 0.1250 - val_loss: 3.0711 Epoch 5/20 2024-04-19 09:22:51.673909: W tensorflow/core/framework/local_rendezvous.cc:404] Local rendezvous is aborting with status: OUT_OF_RANGE: End of sequence [[{{node IteratorGetNext}}]] 2024-04-19 09:22:51.673928: W tensorflow/core/framework/local_rendezvous.cc:404] Local rendezvous is aborting with status: OUT_OF_RANGE: End of sequence [[{{node IteratorGetNext}}]] [[IteratorGetNext/_59]] 2024-04-19 09:22:51.673940: I tensorflow/core/framework/local_rendezvous.cc:422] Local rendezvous recv item cancelled. Key hash: 10431687783238222105 2024-04-19 09:22:51.673944: I tensorflow/core/framework/local_rendezvous.cc:422] Local rendezvous recv item cancelled. Key hash: 17360824274615977051 2024-04-19 09:22:51.673955: I tensorflow/core/framework/local_rendezvous.cc:422] Local rendezvous recv item cancelled. Key hash: 10732905483452597729 My setup is.. Tensor Flow Version: 2.16.1 Python 3.9.19 (main, Mar 21 2024, 12:07:41) [Clang 14.0.6 ] Pandas 2.2.2 Scikit-Learn 1.4.2 GPU is available My generator is.. train_generator = datagen.flow_from_directory( scalp_dir_train, # directory target_size=(256, 256),# all images found will be resized batch_size=32, class_mode='categorical' #subset='training' # Specify the subset as training ) n_samples = train_generator.samples # gets the number of samples validation_generator = datagen.flow_from_directory( scalp_dir_test, # directory path target_size=(256, 256), batch_size=32, class_mode='categorical' #subset='validation' # Specifying the subset as validation Here is my model. early_stopping_monitor = EarlyStopping(patience = 10,restore_best_weights=True) from tensorflow.keras.optimizers import Adam from tensorflow.keras.optimizers import SGD optimizer = Adam(learning_rate=0.01) model = Sequential() model.add(Conv2D(128, (3, 3), activation='relu',padding='same', input_shape=(256, 256, 3))) model.add(BatchNormalization()) model.add(MaxPooling2D((2, 2))) model.add(Dropout(0.3)) model.add(Conv2D(64, (3, 3),padding='same', activation='relu')) model.add(BatchNormalization()) model.add(MaxPooling2D((2, 2))) model.add(Dropout(0.3)) model.add(Flatten()) model.add(Dense(512, activation='relu')) model.add(BatchNormalization()) model.add(Dropout(0.4)) model.add(Dense(256, activation='relu')) model.add(BatchNormalization()) model.add(Dropout(0.3)) model.add(Dense(4, activation='softmax')) # Defined by the number of classes model.compile(optimizer=optimizer, loss='categorical_crossentropy', metrics=['accuracy']) Here is the fit... history=model.fit( train_generator, steps_per_epoch=37, epochs=20, validation_data=validation_generator, validation_steps=12, callbacks=[early_stopping_monitor] #verbose=2 )