Reshape iterator for data_shape or label_shape.

        Parameters
        ----------
        data_shape : tuple or None
            Reshape the data_shape to the new shape if not None
        label_shape : tuple or None
            Reshape label shape to new shape if not None

def reshape(self, data_shape=None, label_shape=None):
        """Reshape iterator for data_shape or label_shape.

        Parameters
        ----------
        data_shape : tuple or None
            Reshape the data_shape to the new shape if not None
        label_shape : tuple or None
            Reshape label shape to new shape if not None
        """
        if data_shape is not None:
            self.check_data_shape(data_shape)
            self.provide_data = [(self.provide_data[0][0], (self.batch_size,) + data_shape)]
            self.data_shape = data_shape
        if label_shape is not None:
            self.check_label_shape(label_shape)
            self.provide_label = [(self.provide_label[0][0], (self.batch_size,) + label_shape)]
            self.label_shape = label_shape