108 lines
2.9 KiB
Python
108 lines
2.9 KiB
Python
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# Copyright (c) Meta Platforms, Inc. and affiliates.
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# All rights reserved.
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# This source code is licensed under the license found in the
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# LICENSE file in the root directory of this source tree.
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import torch
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from functools import partial
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from .modeling import ImageEncoderViT, MaskDecoder, PromptEncoder, Sam, TwoWayTransformer
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def build_sam_vit_h(checkpoint=None):
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return _build_sam(
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encoder_embed_dim=1280,
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encoder_depth=32,
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encoder_num_heads=16,
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encoder_global_attn_indexes=[7, 15, 23, 31],
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checkpoint=checkpoint,
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)
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build_sam = build_sam_vit_h
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def build_sam_vit_l(checkpoint=None):
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return _build_sam(
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encoder_embed_dim=1024,
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encoder_depth=24,
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encoder_num_heads=16,
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encoder_global_attn_indexes=[5, 11, 17, 23],
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checkpoint=checkpoint,
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)
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def build_sam_vit_b(checkpoint=None):
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return _build_sam(
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encoder_embed_dim=768,
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encoder_depth=12,
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encoder_num_heads=12,
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encoder_global_attn_indexes=[2, 5, 8, 11],
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checkpoint=checkpoint,
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)
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sam_model_registry = {
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"default": build_sam,
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"vit_h": build_sam,
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"vit_l": build_sam_vit_l,
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"vit_b": build_sam_vit_b,
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}
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def _build_sam(
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encoder_embed_dim,
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encoder_depth,
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encoder_num_heads,
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encoder_global_attn_indexes,
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checkpoint=None,
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):
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prompt_embed_dim = 256
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image_size = 1024
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vit_patch_size = 16
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image_embedding_size = image_size // vit_patch_size
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sam = Sam(
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image_encoder=ImageEncoderViT(
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depth=encoder_depth,
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embed_dim=encoder_embed_dim,
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img_size=image_size,
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mlp_ratio=4,
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norm_layer=partial(torch.nn.LayerNorm, eps=1e-6),
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num_heads=encoder_num_heads,
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patch_size=vit_patch_size,
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qkv_bias=True,
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use_rel_pos=True,
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global_attn_indexes=encoder_global_attn_indexes,
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window_size=14,
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out_chans=prompt_embed_dim,
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),
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prompt_encoder=PromptEncoder(
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embed_dim=prompt_embed_dim,
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image_embedding_size=(image_embedding_size, image_embedding_size),
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input_image_size=(image_size, image_size),
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mask_in_chans=16,
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),
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mask_decoder=MaskDecoder(
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num_multimask_outputs=3,
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transformer=TwoWayTransformer(
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depth=2,
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embedding_dim=prompt_embed_dim,
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mlp_dim=2048,
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num_heads=8,
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),
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transformer_dim=prompt_embed_dim,
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iou_head_depth=3,
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iou_head_hidden_dim=256,
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),
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pixel_mean=[123.675, 116.28, 103.53],
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pixel_std=[58.395, 57.12, 57.375],
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)
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sam.eval()
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if checkpoint is not None:
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with open(checkpoint, "rb") as f:
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state_dict = torch.load(f)
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sam.load_state_dict(state_dict)
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return sam
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