File size: 2,158 Bytes
a3f6fc6 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | import torch
import einops
import torch.nn as nn
from torchvision import transforms
torch.hub._validate_not_a_forked_repo=lambda a,b,c: True
class DinoV2Encoder(nn.Module):
def __init__(self, name, feature_key, output_dim=None, postprocess=None, n_patches=256):
super().__init__()
print("Encoder feature_key:", feature_key)
self.name = name
self.base_model = torch.hub.load("facebookresearch/dinov2:b48308a", name)
self.feature_key = feature_key
self.emb_dim = self.base_model.num_features
self.output_dim = self.emb_dim # for compatibility
if feature_key == "x_norm_patchtokens":
self.latent_ndim = 2
elif feature_key == "x_norm_clstoken":
self.latent_ndim = 1
else:
raise ValueError(f"Invalid feature key: {feature_key}")
self.patch_size = self.base_model.patch_size
self.postprocess = postprocess
if postprocess is not None:
if postprocess == 'avg_pool':
self.latent_ndim = 1
self.normalization = transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225])
# self.normalization = transforms.Normalize([0.5, 0.5, 0.5], [0.5, 0.5, 0.5])
def forward(self, x):
# Accept arbitrary number of leading dimensions before (C, H, W)
# and preserve them on return.
# Example: input shape (...prefix, C, H, W)
assert x.max() <= 1.0 and x.min() >= 0, "expect 0..1 range"
x = self.normalization(x)
prefix_shape = x.shape[:-3]
c, h, w = x.shape[-3:]
# Collapse all leading dims into a single batch dimension for the base model
prod_prefix = 1
for d in prefix_shape:
prod_prefix *= d
x = x.reshape(prod_prefix, c, h, w)
emb = self.base_model.forward_features(x)[self.feature_key]
emb = emb.reshape(*prefix_shape, *emb.shape[1:])
if self.postprocess == 'avg_pool':
emb = torch.mean(emb, dim=-2) # (...prefix, E)
if self.latent_ndim == 1:
emb = emb.unsqueeze(len(prefix_shape))
return emb
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