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# Copyright (c) 2023-2024, NVIDIA CORPORATION. All rights reserved.
#
# NVIDIA CORPORATION and its licensors retain all intellectual property
# and proprietary rights in and to this software, related documentation
# and any modifications thereto. Any use, reproduction, disclosure or
# distribution of this software and related documentation without an express
# license agreement from NVIDIA CORPORATION is strictly prohibited.
from typing import List, Optional, Set, Tuple, Union
from types import MethodType
import torch
from torch import nn
from timm.models import VisionTransformer, checkpoint_seq
from .feature_normalizer import IntermediateFeatureNormalizerBase, NullIntermediateFeatureNormalizer
from .extra_models import DinoWrapper
from .vit_patch_generator import ViTPatchGenerator
from .forward_intermediates import forward_intermediates
def _forward_cpe(self: VisionTransformer, x: torch.Tensor) -> torch.Tensor:
x = self.patch_generator(x)
if getattr(self, 'grad_checkpointing', False) and not torch.jit.is_scripting():
x = checkpoint_seq(self.blocks, x)
else:
x = self.blocks(x)
x = self.norm(x)
return x
def _take_indices(
num_blocks: int,
n: Optional[Union[int, List[int], Tuple[int]]],
) -> Tuple[Set[int], int]:
if isinstance(n, int):
assert n >= 0
take_indices = {x for x in range(num_blocks - n, num_blocks)}
else:
take_indices = {num_blocks + idx if idx < 0 else idx for idx in n}
return take_indices, max(take_indices)
def _forward_intermediates_cpe(
self,
x: torch.Tensor,
norm: bool = False,
**kwargs,
) -> Union[List[torch.Tensor], Tuple[torch.Tensor, List[torch.Tensor]]]:
return forward_intermediates(
self,
patch_extractor=self.patch_generator,
num_summary_tokens=self.patch_generator.num_skip,
num_cls_tokens=self.patch_generator.num_cls_tokens,
norm=self.norm if norm else lambda y: y,
x=x,
**kwargs,
)
def _forward_cpe_dinov2(self: DinoWrapper, x: torch.Tensor) -> torch.Tensor:
y = _forward_cpe(self.inner, x)
return y[:, 0], y[:, self.num_summary_tokens:]
def _forward_intermediates_cpe_dinov2(self: DinoWrapper, *args, **kwargs):
return _forward_intermediates_cpe(self.inner, *args, **kwargs)
def _enable_cpe_for_timm_vit(model: VisionTransformer,
max_img_size: Union[int, Tuple[int, int]] = 1024,
num_cls_tokens: int = 1,
pos_dropout: float = 0.1,
register_multiple: int = Optional[None],
num_registers: int = Optional[None],
):
if not isinstance(model, VisionTransformer):
raise ValueError("CPE only support for VisionTransformer models!")
patch_size = model.patch_embed.patch_size[0]
embed_dim = model.embed_dim
input_dims = model.patch_embed.img_size
normalize_patches = not isinstance(model.patch_embed.norm, nn.Identity)
cls_token = model.cls_token is not None
max_img_size = int(round(max_img_size / patch_size) * patch_size)
patch_generator = ViTPatchGenerator(
patch_size=patch_size,
embed_dim=embed_dim,
input_dims=input_dims,
normalize_patches=normalize_patches,
cls_token=cls_token,
max_input_dims=max_img_size,
pos_dropout=pos_dropout,
num_cls_tokens=num_cls_tokens,
register_multiple=register_multiple,
num_registers=num_registers,
)
model.patch_generator = patch_generator
model.patch_embed = None
model.cls_token = None
model.pos_embed = None
model.pos_drop = None
model.patch_size = patch_size
model.num_cls_tokens = num_cls_tokens
model.num_registers = patch_generator.num_registers
model.forward_features = MethodType(_forward_cpe, model)
model.forward_intermediates = MethodType(_forward_intermediates_cpe, model)
def _enable_cpe_for_dv2_reg_vit(model: DinoWrapper,
max_img_size: Union[int, Tuple[int, int]] = 1024,
num_cls_tokens: int = 1,
pos_dropout: float = 0.1,
register_multiple: int = Optional[None],
num_registers: int = Optional[None],
):
patch_size = model.patch_size
embed_dim = model.embed_dim
input_dims = model.inner.patch_embed.patches_resolution
normalize_patches = not isinstance(model.inner.patch_embed.norm, nn.Identity)
cls_token = True
max_img_size = int(round(max_img_size / patch_size) * patch_size)
patch_generator = ViTPatchGenerator(
patch_size=patch_size,
embed_dim=embed_dim,
input_dims=input_dims,
normalize_patches=normalize_patches,
cls_token=cls_token,
max_input_dims=max_img_size,
pos_dropout=pos_dropout,
num_cls_tokens=num_cls_tokens,
register_multiple=register_multiple,
num_registers=num_registers,
patch_bias=True,
)
inner = model.inner
inner.patch_generator = patch_generator
inner.patch_embed = None
inner.cls_token = None
inner.pos_embed = None
inner.register_tokens = None
inner.patch_size = patch_size
model.forward_features = MethodType(_forward_cpe_dinov2, model)
model.forward_intermediates = MethodType(_forward_intermediates_cpe_dinov2, model)
def enable_cpe(model: nn.Module,
*args,
**kwargs,
):
if isinstance(model, VisionTransformer):
_enable_cpe_for_timm_vit(model, *args, **kwargs)
elif isinstance(model, DinoWrapper):
_enable_cpe_for_dv2_reg_vit(model, *args, **kwargs)
else:
raise ValueError(f'CPE not supported for this model type: {type(model)}')
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