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
