refiners/scripts/conversion/convert_segment_anything.py

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import argparse
import types
from typing import Any, Callable, cast
import torch
import torch.nn as nn
from segment_anything import build_sam_vit_h # type: ignore
from segment_anything.modeling.common import LayerNorm2d # type: ignore
from torch import Tensor
import refiners.fluxion.layers as fl
from refiners.fluxion.model_converter import ModelConverter
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from refiners.fluxion.utils import load_tensors, manual_seed, save_to_safetensors
from refiners.foundationals.segment_anything.image_encoder import PositionalEncoder, SAMViTH
from refiners.foundationals.segment_anything.mask_decoder import MaskDecoder
from refiners.foundationals.segment_anything.prompt_encoder import MaskEncoder, PointEncoder
class FacebookSAM(nn.Module):
image_encoder: nn.Module
prompt_encoder: nn.Module
mask_decoder: nn.Module
build_sam_vit_h = cast(Callable[[], FacebookSAM], build_sam_vit_h)
assert issubclass(LayerNorm2d, nn.Module)
custom_layers = {LayerNorm2d: fl.LayerNorm2d}
class Args(argparse.Namespace):
source_path: str
output_path: str
half: bool
verbose: bool
def convert_mask_encoder(prompt_encoder: nn.Module) -> dict[str, Tensor]:
manual_seed(seed=0)
refiners_mask_encoder = MaskEncoder()
converter = ModelConverter(
source_model=prompt_encoder.mask_downscaling,
target_model=refiners_mask_encoder,
custom_layer_mapping=custom_layers, # type: ignore
)
x = torch.randn(1, 256, 256)
mapping = converter.map_state_dicts(source_args=(x,))
assert mapping
source_state_dict = prompt_encoder.mask_downscaling.state_dict()
target_state_dict = refiners_mask_encoder.state_dict()
# Mapping handled manually (see below) because nn.Parameter is a special case
del target_state_dict["no_mask_embedding"]
converted_source = converter._convert_state_dict( # pyright: ignore[reportPrivateUsage]
source_state_dict=source_state_dict, target_state_dict=target_state_dict, state_dict_mapping=mapping
)
state_dict: dict[str, Tensor] = {
"no_mask_embedding": nn.Parameter(data=prompt_encoder.no_mask_embed.weight.clone()), # type: ignore
}
state_dict.update(converted_source)
refiners_mask_encoder.load_state_dict(state_dict=state_dict)
return state_dict
def convert_point_encoder(prompt_encoder: nn.Module) -> dict[str, Tensor]:
manual_seed(seed=0)
point_embeddings: list[Tensor] = [pe.weight for pe in prompt_encoder.point_embeddings] + [
prompt_encoder.not_a_point_embed.weight
] # type: ignore
pe = prompt_encoder.pe_layer.positional_encoding_gaussian_matrix # type: ignore
assert isinstance(pe, Tensor)
state_dict: dict[str, Tensor] = {
"Residual.PointTypeEmbedding.weight": nn.Parameter(data=torch.cat(tensors=point_embeddings, dim=0)),
"CoordinateEncoder.Linear.weight": nn.Parameter(data=pe.T.contiguous()),
}
refiners_prompt_encoder = PointEncoder()
refiners_prompt_encoder.load_state_dict(state_dict=state_dict)
return state_dict
def convert_vit(vit: nn.Module) -> dict[str, Tensor]:
manual_seed(seed=0)
refiners_sam_vit_h = SAMViTH()
converter = ModelConverter(
source_model=vit,
target_model=refiners_sam_vit_h,
custom_layer_mapping=custom_layers, # type: ignore
)
converter.skip_init_check = True
x = torch.randn(1, 3, 1024, 1024)
mapping = converter.map_state_dicts(source_args=(x,))
assert mapping
mapping["PositionalEncoder.Parameter.weight"] = "pos_embed"
target_state_dict = refiners_sam_vit_h.state_dict()
del target_state_dict["PositionalEncoder.Parameter.weight"]
source_state_dict = vit.state_dict()
pos_embed = source_state_dict["pos_embed"]
del source_state_dict["pos_embed"]
target_rel_keys = [
(
f"Transformer.TransformerLayer_{i}.Residual_1.FusedSelfAttention.RelativePositionAttention.horizontal_embedding",
f"Transformer.TransformerLayer_{i}.Residual_1.FusedSelfAttention.RelativePositionAttention.vertical_embedding",
)
for i in range(1, 33)
]
source_rel_keys = [(f"blocks.{i}.attn.rel_pos_w", f"blocks.{i}.attn.rel_pos_h") for i in range(32)]
rel_items: dict[str, Tensor] = {}
for (key_w, key_h), (target_key_w, target_key_h) in zip(source_rel_keys, target_rel_keys):
rel_items[target_key_w] = source_state_dict[key_w]
rel_items[target_key_h] = source_state_dict[key_h]
del source_state_dict[key_w]
del source_state_dict[key_h]
del target_state_dict[target_key_w]
del target_state_dict[target_key_h]
converted_source = converter._convert_state_dict( # pyright: ignore[reportPrivateUsage]
source_state_dict=source_state_dict, target_state_dict=target_state_dict, state_dict_mapping=mapping
)
positional_encoder = refiners_sam_vit_h.layer("PositionalEncoder", PositionalEncoder)
embed = pos_embed.reshape_as(positional_encoder.layer("Parameter", fl.Parameter).weight)
converted_source["PositionalEncoder.Parameter.weight"] = embed # type: ignore
converted_source.update(rel_items)
refiners_sam_vit_h.load_state_dict(state_dict=converted_source)
assert converter.compare_models((x,), threshold=1e-2)
return converted_source
def convert_mask_decoder(mask_decoder: nn.Module) -> dict[str, Tensor]:
manual_seed(seed=0)
refiners_mask_decoder = MaskDecoder()
image_embedding = torch.randn(1, 256, 64, 64)
dense_positional_embedding = torch.randn(1, 256, 64, 64)
point_embedding = torch.randn(1, 3, 256)
mask_embedding = torch.randn(1, 256, 64, 64)
from segment_anything.modeling.common import LayerNorm2d # type: ignore
import refiners.fluxion.layers as fl
assert issubclass(LayerNorm2d, nn.Module)
custom_layers = {LayerNorm2d: fl.LayerNorm2d}
converter = ModelConverter(
source_model=mask_decoder,
target_model=refiners_mask_decoder,
custom_layer_mapping=custom_layers, # type: ignore
)
inputs = {
"image_embeddings": image_embedding,
"image_pe": dense_positional_embedding,
"sparse_prompt_embeddings": point_embedding,
"dense_prompt_embeddings": mask_embedding,
"multimask_output": True,
}
refiners_mask_decoder.set_image_embedding(image_embedding)
refiners_mask_decoder.set_point_embedding(point_embedding)
refiners_mask_decoder.set_mask_embedding(mask_embedding)
refiners_mask_decoder.set_dense_positional_embedding(dense_positional_embedding)
mapping = converter.map_state_dicts(source_args=inputs, target_args={})
assert mapping is not None
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mapping["MaskDecoderTokens.Parameter"] = "iou_token"
state_dict = converter._convert_state_dict( # type: ignore
source_state_dict=mask_decoder.state_dict(),
target_state_dict=refiners_mask_decoder.state_dict(),
state_dict_mapping=mapping,
)
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state_dict["MaskDecoderTokens.Parameter.weight"] = torch.cat(
tensors=[mask_decoder.iou_token.weight, mask_decoder.mask_tokens.weight], dim=0
) # type: ignore
refiners_mask_decoder.load_state_dict(state_dict=state_dict)
refiners_mask_decoder.set_image_embedding(image_embedding)
refiners_mask_decoder.set_point_embedding(point_embedding)
refiners_mask_decoder.set_mask_embedding(mask_embedding)
refiners_mask_decoder.set_dense_positional_embedding(dense_positional_embedding)
# Perform (1) upscaling then (2) mask prediction in this order (= like in the official implementation) to make
# `compare_models` happy (MaskPrediction's Matmul runs those in the reverse order by default)
matmul = refiners_mask_decoder.ensure_find(fl.Matmul)
def forward_swapped_order(self: Any, *args: Any) -> Any:
y = self[1](*args) # (1)
x = self[0](*args) # (2)
return torch.matmul(input=x, other=y)
matmul.forward = types.MethodType(forward_swapped_order, matmul)
assert converter.compare_models(source_args=inputs, target_args={}, threshold=1e-3)
return state_dict
def main() -> None:
parser = argparse.ArgumentParser(description="Converts a Segment Anything ViT model to a Refiners SAMViTH model")
parser.add_argument(
"--from",
type=str,
dest="source_path",
default="sam_vit_h_4b8939.pth",
# required=True,
help="Path to the Segment Anything model weights",
)
parser.add_argument(
"--to",
type=str,
dest="output_path",
default="segment-anything-h.safetensors",
help="Output path for converted model (as safetensors).",
)
parser.add_argument("--half", action="store_true", default=False, help="Convert to half precision. Default: False")
parser.add_argument(
"--verbose",
action="store_true",
default=False,
help="Prints additional information during conversion. Default: False",
)
args = parser.parse_args(namespace=Args())
sam_h = build_sam_vit_h() # type: ignore
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sam_h.load_state_dict(state_dict=load_tensors(args.source_path))
vit_state_dict = convert_vit(vit=sam_h.image_encoder)
mask_decoder_state_dict = convert_mask_decoder(mask_decoder=sam_h.mask_decoder)
point_encoder_state_dict = convert_point_encoder(prompt_encoder=sam_h.prompt_encoder)
mask_encoder_state_dict = convert_mask_encoder(prompt_encoder=sam_h.prompt_encoder)
output_state_dict = {
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**{f"SAMViTH.{key}": value for key, value in vit_state_dict.items()},
**{f"MaskDecoder.{key}": value for key, value in mask_decoder_state_dict.items()},
**{f"PointEncoder.{key}": value for key, value in point_encoder_state_dict.items()},
**{f"MaskEncoder.{key}": value for key, value in mask_encoder_state_dict.items()},
}
if args.half:
output_state_dict = {key: value.half() for key, value in output_state_dict.items()}
save_to_safetensors(path=args.output_path, tensors=output_state_dict)
if __name__ == "__main__":
main()