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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_num_filters(layer):
 """Determines the number of filters within the given `layer`. Args: layer: The keras layer to use. Returns: Total number of filters within `layer`. For `keras.layers.Dense` layer, this is the total number of outputs. """

    # Handle layers with no channels.
    if K.ndim(layer.output) == 2:
        return K.int_shape(layer.output)[-1]

    channel_idx = 1 if K.image_data_format() == 'channels_first' else -1
    return K.int_shape(layer.output)[channel_idx]