def calc_reduction_layers(num_cells, num_reduction_layers):
  """Figure out what layers should have reductions."""
  reduction_layers = []
  for pool_num in range(1, num_reduction_layers + 1):
    layer_num = (float(pool_num) / (num_reduction_layers + 1)) * num_cells
    layer_num = int(layer_num)
    reduction_layers.append(layer_num)
  return reduction_layers