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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.
import torch
from functools import partial
from .sam_modeling import ImageEncoderViT, MaskDecoder, PromptEncoder, Sam, TwoWayTransformer, SAMISWrapper
def build_sam_vit_h(checkpoint=None, enable_lora=False, enable_gra=False, mode='eval', image_size=1024):
return _build_sam(
encoder_embed_dim=1280,
encoder_depth=32,
encoder_num_heads=16,
encoder_global_attn_indexes=[7, 15, 23, 31],
checkpoint=checkpoint,
enable_lora=enable_lora,
enable_gra=enable_gra,
mode=mode,
image_size=image_size,
)
build_sam = build_sam_vit_h
def build_sam_vit_l(checkpoint=None, enable_lora=False, enable_gra=False, mode='eval', image_size=1024):
return _build_sam(
encoder_embed_dim=1024,
encoder_depth=24,
encoder_num_heads=16,
encoder_global_attn_indexes=[5, 11, 17, 23],
checkpoint=checkpoint,
enable_lora=enable_lora,
enable_gra=enable_gra,
mode=mode,
image_size=image_size,
)
def build_sam_vit_b(checkpoint=None, enable_lora=False, enable_gra=False, mode='eval', image_size=1024):
return _build_sam(
encoder_embed_dim=768,
encoder_depth=12,
encoder_num_heads=12,
encoder_global_attn_indexes=[2, 5, 8, 11],
checkpoint=checkpoint,
enable_lora=enable_lora,
enable_gra=enable_gra,
mode=mode,
image_size=image_size,
)
sam_model_registry = {
"default": build_sam_vit_h,
"vit_h": build_sam_vit_h,
"vit_l": build_sam_vit_l,
"vit_b": build_sam_vit_b,
}
def _build_sam(
encoder_embed_dim,
encoder_depth,
encoder_num_heads,
encoder_global_attn_indexes,
checkpoint=None,
enable_lora=False,
enable_gra=False,
mode='eval',
image_size=1024,
):
prompt_embed_dim = 256
image_size = image_size
vit_patch_size = 16
image_embedding_size = image_size // vit_patch_size
if mode == 'train':
sam = SAMISWrapper(
encoder_embed_dim=encoder_embed_dim,
encoder_depth=encoder_depth,
encoder_num_heads=encoder_num_heads,
encoder_global_attn_indexes=encoder_global_attn_indexes,
enable_lora=enable_lora,
enable_gra=enable_gra,
with_prev_mask=True,
image_size=image_size,
pixel_mean=[123.675, 116.28, 103.53],
pixel_std=[58.395, 57.12, 57.375],
)
else:
sam = Sam(
image_encoder=ImageEncoderViT(
depth=encoder_depth,
embed_dim=encoder_embed_dim,
img_size=image_size,
mlp_ratio=4,
norm_layer=partial(torch.nn.LayerNorm, eps=1e-6),
num_heads=encoder_num_heads,
patch_size=vit_patch_size,
qkv_bias=True,
use_rel_pos=True,
global_attn_indexes=encoder_global_attn_indexes,
window_size=14,
out_chans=prompt_embed_dim,
),
prompt_encoder=PromptEncoder(
embed_dim=prompt_embed_dim,
image_embedding_size=(image_embedding_size, image_embedding_size),
input_image_size=(image_size, image_size),
mask_in_chans=16,
),
mask_decoder=MaskDecoder(
num_multimask_outputs=3,
transformer=TwoWayTransformer(
depth=2,
embedding_dim=prompt_embed_dim,
mlp_dim=2048,
num_heads=8,
),
transformer_dim=prompt_embed_dim,
iou_head_depth=3,
iou_head_hidden_dim=256,
),
pixel_mean=[123.675, 116.28, 103.53],
pixel_std=[58.395, 57.12, 57.375],
)
sam.eval()
if checkpoint is not None:
with open(checkpoint, "rb") as f:
pretrained_dict = torch.load(f)
model_dict = sam.state_dict()
new_pretrained_dict = {}
for k, v in pretrained_dict.items():
if k in model_dict and v.shape == model_dict[k].shape:
new_pretrained_dict[k] = v
msg = sam.load_state_dict(new_pretrained_dict, strict=False)
print("SAM load Info: ", msg)
return sam
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