# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
# https://github.com/facebookresearch/detr

import copy
import torch.nn as nn
import torch.nn.functional as F


def get_clones(module, N):
    return nn.ModuleList([copy.deepcopy(module) for i in range(N)])

def get_activation_fn(activation):
    """Return an activation function given a string"""
    if activation == "relu":
        return F.relu
    if activation == "gelu":
        return F.gelu
    if activation == "glu":
        return F.glu
    raise RuntimeError(F"activation should be relu/gelu, not {activation}.")