Bus error raspberry pi

Question

I have a function make_model() which works fine everywhere and I ran it on my raspberry pi in the morning and it worked fine but now it gets the following error:

Using TensorFlow backend.
2020-07-11 15:15:18.946541: W tensorflow/core/framework/cpu_allocator_impl.cc:81] Allocation of 2097152 exceeds 10% of system memory.
2020-07-11 15:15:18.952599: W tensorflow/core/framework/cpu_allocator_impl.cc:81] Allocation of 2097152 exceeds 10% of system memory.
2020-07-11 15:15:18.955832: W tensorflow/core/framework/cpu_allocator_impl.cc:81] Allocation of 2097152 exceeds 10% of system memory.
2020-07-11 15:15:19.100194: W tensorflow/core/framework/cpu_allocator_impl.cc:81] Allocation of 4194304 exceeds 10% of system memory.
2020-07-11 15:15:19.112173: W tensorflow/core/framework/cpu_allocator_impl.cc:81] Allocation of 4194304 exceeds 10% of system memory.
Train on 184 samples, validate on 46 samples
Epoch 1/32
 32/184 [====>.........................] - ETA: 2s - loss: 2.8498 - accuracy: 0. 64/184 [=========>....................] - ETA: 1s - loss: 2.7108 - accuracy: 0. 96/184 [==============>...............] - ETA: 0s - loss: 2.6015 - accuracy: 0.128/184 [===================>..........] - ETA: 0s - loss: 2.4629 - accuracy: 0.160/184 [=========================>....] - ETA: 0s - loss: 2.3413 - accuracy: 0.5813Bus error

This is my code:

class SoftMax():
    def __init__(self, input_shape, num_classes):
        self.input_shape = input_shape
        self.num_classes = num_classes

    def build(self):
        #create model
        model = Sequential()

        #add model layers
        model.add(Dense(1024, activation='relu', input_shape=self.input_shape))
        model.add(Dropout(0.5))
        model.add(Dense(1024, activation='relu'))
        model.add(Dropout(0.5))
        model.add(Dense(self.num_classes, activation='softmax'))
        
        # loss and optimizer
        optimizer=Adam(learning_rate=0.001, beta_1=0.9, beta_2=0.999, amsgrad=False)
        model.compile(loss=categorical_crossentropy,
                      optimizer=optimizer,
                      metrics=['accuracy'])
        return model

def make_model(args, classifier=SoftMax):

    # Load the face embeddings
    data = pickle.loads(open(args.embeddings, "rb").read())

    num_classes = len(np.unique(data["names"])) 
    ct = ColumnTransformer([('myٔName', OneHotEncoder(), [0])])
    labels = np.array(data["names"]).reshape(-1, 1)
    labels = ct.fit_transform(labels)

    embeddings = np.array(data["embeddings"])

    # Initialize Softmax training model arguments
    BATCH_SIZE = 32
    EPOCHS = 32
    input_shape = embeddings.shape[1]

    # Build classifier
    init_classifier = classifier(input_shape=(input_shape,), num_classes=num_classes)
    model = init_classifier.build()

    # Create KFold
    cv = KFold(n_splits = 5, random_state = None, shuffle=True)
    history = {'acc': [], 'val_acc': [], 'loss': [], 'val_loss': []}
    # Train
    for train_idx, valid_idx in cv.split(embeddings):
        X_train, X_val, y_train, y_val = embeddings[train_idx], embeddings[valid_idx], labels[train_idx], labels[valid_idx]
        his = model.fit(X_train, y_train, batch_size=BATCH_SIZE, epochs=EPOCHS, verbose=1, validation_data=(X_val, y_val))


    # write the face recognition model to output
    model.save(args.mymodel)
    f = open(args.le, "wb")
    f.write(pickle.dumps(LabelEncoder()))
    f.close()

Can someone help me? what's the issue?