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# Copyright (c) Facebook, Inc. and its affiliates.
# Copyright (c) Meta Platforms, Inc. All Rights Reserved
import logging
from typing import Callable, Dict, List, Optional, Tuple, Union
import fvcore.nn.weight_init as weight_init
from torch import nn
from torch.nn import functional as F
from detectron2.config import configurable
from detectron2.layers import Conv2d, ShapeSpec, get_norm
from detectron2.modeling import SEM_SEG_HEADS_REGISTRY
from ..transformer.position_encoding import PositionEmbeddingSine
from ..transformer.transformer import TransformerEncoder, TransformerEncoderLayer
def build_pixel_decoder(cfg, input_shape):
"""
Build a pixel decoder from `cfg.MODEL.MASK_FORMER.PIXEL_DECODER_NAME`.
"""
name = cfg.MODEL.SEM_SEG_HEAD.PIXEL_DECODER_NAME
model = SEM_SEG_HEADS_REGISTRY.get(name)(cfg, input_shape)
forward_features = getattr(model, "forward_features", None)
if not callable(forward_features):
raise ValueError(
"Only SEM_SEG_HEADS with forward_features method can be used as pixel decoder. "
f"Please implement forward_features for {name} to only return mask features."
)
return model
@SEM_SEG_HEADS_REGISTRY.register()
class BasePixelDecoder(nn.Module):
@configurable
def __init__(
self,
input_shape: Dict[str, ShapeSpec],
*,
conv_dim: int,
mask_dim: int,
norm: Optional[Union[str, Callable]] = None,
):
"""
NOTE: this interface is experimental.
Args:
input_shape: shapes (channels and stride) of the input features
conv_dims: number of output channels for the intermediate conv layers.
mask_dim: number of output channels for the final conv layer.
norm (str or callable): normalization for all conv layers
"""
super().__init__()
input_shape = sorted(input_shape.items(), key=lambda x: x[1].stride)
self.in_features = [k for k, v in input_shape] # starting from "res2" to "res5"
feature_channels = [v.channels for k, v in input_shape]
lateral_convs = []
output_convs = []
use_bias = norm == ""
for idx, in_channels in enumerate(feature_channels):
if idx == len(self.in_features) - 1:
output_norm = get_norm(norm, conv_dim)
output_conv = Conv2d(
in_channels,
conv_dim,
kernel_size=3,
stride=1,
padding=1,
bias=use_bias,
norm=output_norm,
activation=F.relu,
)
weight_init.c2_xavier_fill(output_conv)
self.add_module("layer_{}".format(idx + 1), output_conv)
lateral_convs.append(None)
output_convs.append(output_conv)
else:
lateral_norm = get_norm(norm, conv_dim)
output_norm = get_norm(norm, conv_dim)
lateral_conv = Conv2d(
in_channels,
conv_dim,
kernel_size=1,
bias=use_bias,
norm=lateral_norm,
)
output_conv = Conv2d(
conv_dim,
conv_dim,
kernel_size=3,
stride=1,
padding=1,
bias=use_bias,
norm=output_norm,
activation=F.relu,
)
weight_init.c2_xavier_fill(lateral_conv)
weight_init.c2_xavier_fill(output_conv)
self.add_module("adapter_{}".format(idx + 1), lateral_conv)
self.add_module("layer_{}".format(idx + 1), output_conv)
lateral_convs.append(lateral_conv)
output_convs.append(output_conv)
# Place convs into top-down order (from low to high resolution)
# to make the top-down computation in forward clearer.
self.lateral_convs = lateral_convs[::-1]
self.output_convs = output_convs[::-1]
self.mask_dim = mask_dim
self.mask_features = Conv2d(
conv_dim,
mask_dim,
kernel_size=3,
stride=1,
padding=1,
)
weight_init.c2_xavier_fill(self.mask_features)
@classmethod
def from_config(cls, cfg, input_shape: Dict[str, ShapeSpec]):
ret = {}
ret["input_shape"] = {
k: v
for k, v in input_shape.items()
if k in cfg.MODEL.SEM_SEG_HEAD.IN_FEATURES
}
ret["conv_dim"] = cfg.MODEL.SEM_SEG_HEAD.CONVS_DIM
ret["mask_dim"] = cfg.MODEL.SEM_SEG_HEAD.MASK_DIM
ret["norm"] = cfg.MODEL.SEM_SEG_HEAD.NORM
return ret
def forward_features(self, features):
# Reverse feature maps into top-down order (from low to high resolution)
for idx, f in enumerate(self.in_features[::-1]):
x = features[f]
lateral_conv = self.lateral_convs[idx]
output_conv = self.output_convs[idx]
if lateral_conv is None:
y = output_conv(x)
else:
cur_fpn = lateral_conv(x)
# Following FPN implementation, we use nearest upsampling here
y = cur_fpn + F.interpolate(y, size=cur_fpn.shape[-2:], mode="nearest")
y = output_conv(y)
return self.mask_features(y), None
def forward(self, features, targets=None):
logger = logging.getLogger(__name__)
logger.warning(
"Calling forward() may cause unpredicted behavior of PixelDecoder module."
)
return self.forward_features(features)
class TransformerEncoderOnly(nn.Module):
def __init__(
self,
d_model=512,
nhead=8,
num_encoder_layers=6,
dim_feedforward=2048,
dropout=0.1,
activation="relu",
normalize_before=False,
):
super().__init__()
encoder_layer = TransformerEncoderLayer(
d_model, nhead, dim_feedforward, dropout, activation, normalize_before
)
encoder_norm = nn.LayerNorm(d_model) if normalize_before else None
self.encoder = TransformerEncoder(
encoder_layer, num_encoder_layers, encoder_norm
)
self._reset_parameters()
self.d_model = d_model
self.nhead = nhead
def _reset_parameters(self):
for p in self.parameters():
if p.dim() > 1:
nn.init.xavier_uniform_(p)
def forward(self, src, mask, pos_embed):
# flatten NxCxHxW to HWxNxC
bs, c, h, w = src.shape
src = src.flatten(2).permute(2, 0, 1)
pos_embed = pos_embed.flatten(2).permute(2, 0, 1)
if mask is not None:
mask = mask.flatten(1)
memory = self.encoder(src, src_key_padding_mask=mask, pos=pos_embed)
return memory.permute(1, 2, 0).view(bs, c, h, w)
@SEM_SEG_HEADS_REGISTRY.register()
class TransformerEncoderPixelDecoder(BasePixelDecoder):
@configurable
def __init__(
self,
input_shape: Dict[str, ShapeSpec],
*,
transformer_dropout: float,
transformer_nheads: int,
transformer_dim_feedforward: int,
transformer_enc_layers: int,
transformer_pre_norm: bool,
conv_dim: int,
mask_dim: int,
norm: Optional[Union[str, Callable]] = None,
):
"""
NOTE: this interface is experimental.
Args:
input_shape: shapes (channels and stride) of the input features
transformer_dropout: dropout probability in transformer
transformer_nheads: number of heads in transformer
transformer_dim_feedforward: dimension of feedforward network
transformer_enc_layers: number of transformer encoder layers
transformer_pre_norm: whether to use pre-layernorm or not
conv_dims: number of output channels for the intermediate conv layers.
mask_dim: number of output channels for the final conv layer.
norm (str or callable): normalization for all conv layers
"""
super().__init__(input_shape, conv_dim=conv_dim, mask_dim=mask_dim, norm=norm)
input_shape = sorted(input_shape.items(), key=lambda x: x[1].stride)
self.in_features = [k for k, v in input_shape] # starting from "res2" to "res5"
feature_strides = [v.stride for k, v in input_shape]
feature_channels = [v.channels for k, v in input_shape]
in_channels = feature_channels[len(self.in_features) - 1]
self.input_proj = Conv2d(in_channels, conv_dim, kernel_size=1)
weight_init.c2_xavier_fill(self.input_proj)
self.transformer = TransformerEncoderOnly(
d_model=conv_dim,
dropout=transformer_dropout,
nhead=transformer_nheads,
dim_feedforward=transformer_dim_feedforward,
num_encoder_layers=transformer_enc_layers,
normalize_before=transformer_pre_norm,
)
N_steps = conv_dim // 2
self.pe_layer = PositionEmbeddingSine(N_steps, normalize=True)
# update layer
use_bias = norm == ""
output_norm = get_norm(norm, conv_dim)
output_conv = Conv2d(
conv_dim,
conv_dim,
kernel_size=3,
stride=1,
padding=1,
bias=use_bias,
norm=output_norm,
activation=F.relu,
)
weight_init.c2_xavier_fill(output_conv)
delattr(self, "layer_{}".format(len(self.in_features)))
self.add_module("layer_{}".format(len(self.in_features)), output_conv)
self.output_convs[0] = output_conv
@classmethod
def from_config(cls, cfg, input_shape: Dict[str, ShapeSpec]):
ret = super().from_config(cfg, input_shape)
ret["transformer_dropout"] = cfg.MODEL.MASK_FORMER.DROPOUT
ret["transformer_nheads"] = cfg.MODEL.MASK_FORMER.NHEADS
ret["transformer_dim_feedforward"] = cfg.MODEL.MASK_FORMER.DIM_FEEDFORWARD
ret[
"transformer_enc_layers"
] = cfg.MODEL.SEM_SEG_HEAD.TRANSFORMER_ENC_LAYERS # a separate config
ret["transformer_pre_norm"] = cfg.MODEL.MASK_FORMER.PRE_NORM
return ret
def forward_features(self, features):
# Reverse feature maps into top-down order (from low to high resolution)
for idx, f in enumerate(self.in_features[::-1]):
x = features[f]
lateral_conv = self.lateral_convs[idx]
output_conv = self.output_convs[idx]
if lateral_conv is None:
transformer = self.input_proj(x)
pos = self.pe_layer(x)
transformer = self.transformer(transformer, None, pos)
y = output_conv(transformer)
# save intermediate feature as input to Transformer decoder
transformer_encoder_features = transformer
else:
cur_fpn = lateral_conv(x)
# Following FPN implementation, we use nearest upsampling here
y = cur_fpn + F.interpolate(y, size=cur_fpn.shape[-2:], mode="nearest")
y = output_conv(y)
return self.mask_features(y), transformer_encoder_features
def forward(self, features, targets=None):
logger = logging.getLogger(__name__)
logger.warning(
"Calling forward() may cause unpredicted behavior of PixelDecoder module."
)
return self.forward_features(features)
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