def bds(x, n_filters):
     return nn.BackDownShiftConv3D(n_filters,
                                   filter_size=filter_size,
                                   **conv_args)(x)
 def bds(x):
     return nn.BackDownShiftConv3D(n_filters, use_bias=False,
                                   nln=tf.nn.elu)(x)