def skip_autoencoder(path_train, path_valid, batch_size, epochs, path_save_model, path_weights_model, option):

    # initializing

    #!/usr/bin/env python3
    # -*- coding: utf8 -*-
    import ctypes
    import os
    os.environ['TF_CPP_MIN_LOG_LEVEL'] = '1'
    os.environ['TF_ENABLE_XLA'] = '1'
    os.environ['TF_ENABLE_AUTO_MIXED_PRECISION'] = '1'
    os.environ['TF_ENABLE_CUDNN_RNN_TENSOR_OP_MATH_FP32'] = '1'
    os.environ['TF_DISABLE_CUDNN_TENSOR_OP_MATH'] = '1'
    os.environ['TF_ENABLE_CUBLAS_TENSOR_OP_MATH_FP32'] = '1'

    import numpy as np
    import tensorflow as tf
    from tensorflow import keras
    from keras.layers import Add, Input, Dense, Flatten, Dropout, Conv2D, MaxPooling2D, Conv2DTranspose, LeakyReLU, Reshape, Activation, BatchNormalization, UpSampling2D
    from keras.models import Model
    from keras.constraints import max_norm
    from keras.optimizers import Adam, SGD
    from keras.utils import to_categorical, normalize
    from keras.callbacks import ModelCheckpoint
    from keras import losses
    from keras import backend as K
    import matplotlib.pyplot as plt
    import random

    # searching for gpus and using it/them

    gpus = tf.config.experimental.list_physical_devices('GPU')
    if gpus:
        try:
            tf.config.experimental.set_virtual_device_configuration(gpus[0], [tf.config.experimental.VirtualDeviceConfiguration(memory_limit=4096)])
        except RuntimeError as e:
            print(e)

    # building model

    def build_model(self):
        max_norm_value = 100.0

        # defining input and normalizing

        input = Input(shape=(260,5,1))
        normalized = BatchNormalization()(input)

        # encoder

        conv_1 = Conv2D(filters=32, kernel_size=(1,3),strides=1,padding="valid",kernel_constraint=max_norm(max_norm_value), kernel_initializer="he_normal")(input)
        leakyrelu_1 = LeakyReLU()(conv_1)
        conv_2 = Conv2D(filters=32, kernel_size=(1,3),strides=1,padding="valid",kernel_constraint=max_norm(max_norm_value), kernel_initializer="he_normal")(leakyrelu_1)
        leakyrelu_2 = LeakyReLU()(conv_2)
        conv_3 = Conv2D(filters=32, kernel_size=(16,1),strides=1,padding="same", kernel_constraint=max_norm(max_norm_value), kernel_initializer="he_normal")(leakyrelu_2)
        leakyrelu_3 = LeakyReLU()(conv_3)
        maxpool_1 = MaxPooling2D(pool_size=(2,1))(leakyrelu_3)
        conv_4 = Conv2D(filters=32, kernel_size=(16,1),strides=1,padding="same", kernel_constraint=max_norm(max_norm_value), kernel_initializer="he_normal")(maxpool_1)
        leakyrelu_4 = LeakyReLU()(conv_4)
        maxpool_2 = MaxPooling2D(pool_size=(2,1))(leakyrelu_4)
        conv_5 = Conv2D(filters=32, kernel_size=(16,1),strides=1,padding="valid", kernel_constraint=max_norm(max_norm_value), kernel_initializer="he_normal")(maxpool_2)
        leakyrelu_5 = LeakyReLU()(conv_5)
        conv_6 = Conv2D(filters=32, kernel_size=(16,1),strides=1,padding="valid", kernel_constraint=max_norm(max_norm_value), kernel_initializer="he_normal")(leakyrelu_5)
        leakyrelu_6 = LeakyReLU()(conv_6)

        # decoder

        convtrans_1 = Conv2DTranspose(filters=32, kernel_size=(16,1),strides=1,padding="valid", kernel_constraint=max_norm(max_norm_value), kernel_initializer="he_normal")(leakyrelu_6)
        leakyrelu_7 = LeakyReLU()(convtrans_1)
        convtrans_2 = Conv2DTranspose(filters=32, kernel_size=(16,1),strides=1, padding="valid", kernel_constraint=max_norm(max_norm_value), kernel_initializer="he_normal")(leakyrelu_7)
        leakyrelu_8 = LeakyReLU()(convtrans_2)
        skip_1 = Add()([maxpool_2,leakyrelu_8])
        up_1 = UpSampling2D(size=(2,1))(skip_1)
        conv_7 = Conv2D(filters=32, kernel_size=(16,1), strides=1, padding="same", kernel_constraint=max_norm(max_norm_value), kernel_initializer="he_normal")(up_1)
        leakyrelu_9 = LeakyReLU()(conv_7)
        skip_2 = Add()([leakyrelu_4,leakyrelu_9])
        up_2 = UpSampling2D(size=(2,1))(skip_2)
        conv_8 = Conv2D(filters=32, kernel_size=(16,1), strides=1, padding="same", kernel_constraint=max_norm(max_norm_value), kernel_initializer="he_normal")(up_2)
        leakyrelu_10 = LeakyReLU()(conv_8)
        skip_3 = Add()([leakyrelu_3,leakyrelu_10])
        conv_9 = Conv2D(filters=1, kernel_size=(16,1),strides=1, padding="same", activation='linear', kernel_constraint=max_norm(max_norm_value), kernel_initializer="he_normal")(skip_3)

        # defining model with input and output (i.e. target)

        model = Model(inputs=input, outputs=conv_9)
        return model

    if __name__ == "__main__":

        # building and compiling model

        model = build_model()
        model.compile(loss='mse', optimizer='adam', metrics=['metrics','accuracy'])

        # making directory for training weights

        if not os.path.exists(path_weights_model):
            try:
                os.mkdir(path_weights_model)
            except Exception as e:
                print("Konnte Ordner für Gewichte nicht erstellen" + str(e))

        # defining how weights are saved

        filepath = path_weights_model + "/weights-{epoch:02d}-{loss:.4f}.hdf5"
        checkpoint = ModelCheckpoint(
            filepath,
            monitor='loss',
            verbose=0,
            save_best_only=True,
            mode='min'
        )
        model.summary()

        # train model

        history = model.fit(train_generator, steps_per_epoch = int(np.floor(len(train) / batch_size)), epochs = epochs, validation_data = valid_generator, validation_steps = int(np.floor(len(valid) / batch_size)), callbacks=[checkpoint], use_multiprocessing=True)
        model.summary()

        # save model after training

        model.save(path_save_model)

        # plot train and validation loss after training ends

        plt.style.use("ggplot")
        plt.figure()
        plt.plot(history.history["loss"], label="train_loss")
        plt.plot(history.history["val_loss"], label="val_loss")
        plt.title("Training Loss and Accuracy")
        plt.xlabel("Epochs")
        plt.ylabel("Loss/Accuracy")
        plt.legend(loc="lower left")
        plt.savefig(path_save_model + '/testrun.png', dpi=400)

        plt.show()

        return