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# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
# This source code is licensed under the license found in the
# LICENSE file in the root directory of this source tree.
# --------------------------------------------------------
# References:
# timm: https://github.com/rwightman/pytorch-image-models/tree/master/timm
# DeiT: https://github.com/facebookresearch/deit
# --------------------------------------------------------
from functools import partial
import torch
import torch.nn as nn
import numpy as np
import timm.models.vision_transformer
from timm.models.vision_transformer import PatchEmbed, Block
from audioldm_train.modules.audiomae.util.patch_embed import (
PatchEmbed_new,
PatchEmbed3D_new,
)
class VisionTransformer(timm.models.vision_transformer.VisionTransformer):
"""Vision Transformer with support for global average pooling"""
def __init__(
self, global_pool=False, mask_2d=True, use_custom_patch=False, **kwargs
):
super(VisionTransformer, self).__init__(**kwargs)
self.global_pool = global_pool
if self.global_pool:
norm_layer = kwargs["norm_layer"]
embed_dim = kwargs["embed_dim"]
self.fc_norm = norm_layer(embed_dim)
del self.norm # remove the original norm
self.mask_2d = mask_2d
self.use_custom_patch = use_custom_patch
num_heads = 12
depth = 12
mlp_ratio = 4
def forward_features(self, x):
B = x.shape[0]
x = self.patch_embed(x)
x = x + self.pos_embed[:, 1:, :]
cls_token = self.cls_token + self.pos_embed[:, :1, :]
cls_tokens = cls_token.expand(
B, -1, -1
) # stole cls_tokens impl from Phil Wang, thanks
x = torch.cat((cls_tokens, x), dim=1)
x = self.pos_drop(x)
for blk in self.blocks:
x = blk(x)
if self.global_pool:
x = x[:, 1:, :].mean(dim=1) # global pool without cls token
outcome = self.fc_norm(x)
else:
x = self.norm(x)
outcome = x[:, 0]
return outcome
def random_masking(self, x, mask_ratio):
"""
Perform per-sample random masking by per-sample shuffling.
Per-sample shuffling is done by argsort random noise.
x: [N, L, D], sequence
"""
N, L, D = x.shape # batch, length, dim
len_keep = int(L * (1 - mask_ratio))
noise = torch.rand(N, L, device=x.device) # noise in [0, 1]
# sort noise for each sample
ids_shuffle = torch.argsort(
noise, dim=1
) # ascend: small is keep, large is remove
ids_restore = torch.argsort(ids_shuffle, dim=1)
# keep the first subset
ids_keep = ids_shuffle[:, :len_keep]
x_masked = torch.gather(x, dim=1, index=ids_keep.unsqueeze(-1).repeat(1, 1, D))
# generate the binary mask: 0 is keep, 1 is remove
mask = torch.ones([N, L], device=x.device)
mask[:, :len_keep] = 0
# unshuffle to get the binary mask
mask = torch.gather(mask, dim=1, index=ids_restore)
return x_masked, mask, ids_restore
def random_masking_2d(self, x, mask_t_prob, mask_f_prob):
"""
2D: Spectrogram (msking t and f under mask_t_prob and mask_f_prob)
Perform per-sample random masking by per-sample shuffling.
Per-sample shuffling is done by argsort random noise.
x: [N, L, D], sequence
"""
N, L, D = x.shape # batch, length, dim
if self.use_custom_patch:
# # for AS
T = 101 # 64,101
F = 12 # 8,12
# # for ESC
# T=50
# F=12
# for SPC
# T=12
# F=12
else:
# ## for AS
T = 64
F = 8
# ## for ESC
# T=32
# F=8
## for SPC
# T=8
# F=8
# mask T
x = x.reshape(N, T, F, D)
len_keep_T = int(T * (1 - mask_t_prob))
noise = torch.rand(N, T, device=x.device) # noise in [0, 1]
# sort noise for each sample
ids_shuffle = torch.argsort(
noise, dim=1
) # ascend: small is keep, large is remove
ids_keep = ids_shuffle[:, :len_keep_T]
index = ids_keep.unsqueeze(-1).unsqueeze(-1).repeat(1, 1, F, D)
# x_masked = torch.gather(x, dim=1, index=index)
# x_masked = x_masked.reshape(N,len_keep_T*F,D)
x = torch.gather(x, dim=1, index=index) # N, len_keep_T(T'), F, D
# mask F
# x = x.reshape(N, T, F, D)
x = x.permute(0, 2, 1, 3) # N T' F D => N F T' D
len_keep_F = int(F * (1 - mask_f_prob))
noise = torch.rand(N, F, device=x.device) # noise in [0, 1]
# sort noise for each sample
ids_shuffle = torch.argsort(
noise, dim=1
) # ascend: small is keep, large is remove
ids_keep = ids_shuffle[:, :len_keep_F]
# index = ids_keep.unsqueeze(-1).unsqueeze(-1).repeat(1, 1, T, D)
index = ids_keep.unsqueeze(-1).unsqueeze(-1).repeat(1, 1, len_keep_T, D)
x_masked = torch.gather(x, dim=1, index=index)
x_masked = x_masked.permute(0, 2, 1, 3) # N F' T' D => N T' F' D
# x_masked = x_masked.reshape(N,len_keep*T,D)
x_masked = x_masked.reshape(N, len_keep_F * len_keep_T, D)
return x_masked, None, None
def forward_features_mask(self, x, mask_t_prob, mask_f_prob):
B = x.shape[0] # 4,1,1024,128
x = self.patch_embed(x) # 4, 512, 768
x = x + self.pos_embed[:, 1:, :]
if self.random_masking_2d:
x, mask, ids_restore = self.random_masking_2d(x, mask_t_prob, mask_f_prob)
else:
x, mask, ids_restore = self.random_masking(x, mask_t_prob)
cls_token = self.cls_token + self.pos_embed[:, :1, :]
cls_tokens = cls_token.expand(B, -1, -1)
x = torch.cat((cls_tokens, x), dim=1)
x = self.pos_drop(x)
# apply Transformer blocks
for blk in self.blocks:
x = blk(x)
if self.global_pool:
x = x[:, 1:, :].mean(dim=1) # global pool without cls token
outcome = self.fc_norm(x)
else:
x = self.norm(x)
outcome = x[:, 0]
return outcome
# overwrite original timm
def forward(self, x, v=None, mask_t_prob=0.0, mask_f_prob=0.0):
if mask_t_prob > 0.0 or mask_f_prob > 0.0:
x = self.forward_features_mask(
x, mask_t_prob=mask_t_prob, mask_f_prob=mask_f_prob
)
else:
x = self.forward_features(x)
x = self.head(x)
return x
def vit_small_patch16(**kwargs):
model = VisionTransformer(
patch_size=16,
embed_dim=384,
depth=12,
num_heads=6,
mlp_ratio=4,
qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6),
**kwargs
)
return model
def vit_base_patch16(**kwargs):
model = VisionTransformer(
patch_size=16,
embed_dim=768,
depth=12,
num_heads=12,
mlp_ratio=4,
qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6),
**kwargs
)
return model
def vit_large_patch16(**kwargs):
model = VisionTransformer(
patch_size=16,
embed_dim=1024,
depth=24,
num_heads=16,
mlp_ratio=4,
qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6),
**kwargs
)
return model
def vit_huge_patch14(**kwargs):
model = VisionTransformer(
patch_size=14,
embed_dim=1280,
depth=32,
num_heads=16,
mlp_ratio=4,
qkv_bias=True,
norm_layer=partial(nn.LayerNorm, eps=1e-6),
**kwargs
)
return model
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