[WIP] Dev

README.md

@@ -12,7 +12,7 @@ Tool box for PyTorch for fast prototyping.
 * [TTA wrapper](./pytorch_tools/tta_wrapper/) - wrapper for easy test-time augmentation
 
 # Installation
-Requeres GPU drivers and CUDA already installed.
+Requires GPU drivers and CUDA already installed.
 
 `pip install -v --no-cache-dir --global-option="--cpp_ext" --global-option="--cuda_ext" git+https://github.com/NVIDIA/apex.git`  
 `pip install git+https://github.com/bonlime/pytorch-tools.git@master`

pytorch_tools/__init__.py

@@ -1,4 +1,4 @@
-__version__ = "0.1.4"
+__version__ = "0.1.5"
 
 from . import fit_wrapper
 from . import losses
@@ -9,3 +9,4 @@
 from . import segmentation_models
 from . import tta_wrapper
 from . import utils
+from . import detection_models

pytorch_tools/detection_models/__init__.py

@@ -0,0 +1,12 @@
+from .retinanet import RetinaNet
+from .retinanet import retinanet_r50_fpn
+from .retinanet import retinanet_r101_fpn
+
+from .efficientdet import EfficientDet
+from .efficientdet import efficientdet_d0
+from .efficientdet import efficientdet_d1
+from .efficientdet import efficientdet_d2
+from .efficientdet import efficientdet_d3
+from .efficientdet import efficientdet_d4
+from .efficientdet import efficientdet_d5
+from .efficientdet import efficientdet_d6

pytorch_tools/detection_models/efficientdet.py

@@ -0,0 +1,329 @@
+import logging
+from copy import deepcopy
+from functools import wraps
+
+import torch
+import torch.nn as nn
+from torch.hub import load_state_dict_from_url
+
+from pytorch_tools.modules import ABN
+from pytorch_tools.modules.bifpn import BiFPN
+from pytorch_tools.modules import bn_from_name
+from pytorch_tools.modules.residual import conv1x1
+from pytorch_tools.modules.residual import conv3x3
+from pytorch_tools.modules.residual import DepthwiseSeparableConv
+from pytorch_tools.modules.tf_same_ops import conv_to_same_conv
+from pytorch_tools.modules.tf_same_ops import maxpool_to_same_maxpool
+
+from pytorch_tools.segmentation_models.encoders import get_encoder
+
+import pytorch_tools.utils.box as box_utils
+from pytorch_tools.utils.misc import DEFAULT_IMAGENET_SETTINGS
+from pytorch_tools.utils.misc import initialize_iterator
+
+
+def patch_bn(module):
+    """TF ported weights use slightly different eps in BN. Need to adjust for better performance"""
+    if isinstance(module, ABN):
+        module.eps = 1e-3
+        module.momentum = 1e-2
+    for m in module.children():
+        patch_bn(m)
+
+
+class EfficientDet(nn.Module):
+    """TODO: add docstring"""
+
+    def __init__(
+        self,
+        pretrained="coco",  # Not used. here for proper signature
+        encoder_name="efficientnet_d0",
+        encoder_weights="imagenet",
+        pyramid_channels=64,
+        num_fpn_layers=3,
+        num_head_repeats=3,
+        num_classes=90,
+        drop_connect_rate=0,
+        encoder_norm_layer="abn",  # TODO: set to frozenabn when ready
+        encoder_norm_act="swish",
+        decoder_norm_layer="abn",
+        decoder_norm_act="swish",
+        match_tf_same_padding=False,
+    ):
+        super().__init__()
+        self.encoder = get_encoder(
+            encoder_name,
+            norm_layer=encoder_norm_layer,
+            norm_act=encoder_norm_act,
+            encoder_weights=encoder_weights,
+        )
+        norm_layer = bn_from_name(decoder_norm_layer)
+        bn_args = dict(norm_layer=norm_layer, norm_act=decoder_norm_act)
+        self.pyramid6 = nn.Sequential(
+            conv1x1(self.encoder.out_shapes[0], pyramid_channels, bias=True),
+            norm_layer(pyramid_channels, activation="identity"),
+            nn.MaxPool2d(3, stride=2, padding=1),
+        )
+        self.pyramid7 = nn.MaxPool2d(3, stride=2, padding=1)  # in EffDet it's a simple maxpool
+
+        self.bifpn = BiFPN(
+            self.encoder.out_shapes[:-2],
+            pyramid_channels=pyramid_channels,
+            num_layers=num_fpn_layers,
+            **bn_args,
+        )
+
+        def make_head(out_size):
+            layers = []
+            for _ in range(num_head_repeats):
+                # TODO: add drop connect
+                layers += [DepthwiseSeparableConv(pyramid_channels, pyramid_channels, use_norm=False)]
+            layers += [DepthwiseSeparableConv(pyramid_channels, out_size, use_norm=False)]
+            return nn.ModuleList(layers)
+
+        # The convolution layers in the head are shared among all levels, but
+        # each level has its batch normalization to capture the statistical
+        # difference among different levels.
+        def make_head_norm():
+            return nn.ModuleList(
+                [
+                    nn.ModuleList(
+                        [
+                            norm_layer(pyramid_channels, activation=decoder_norm_act)
+                            for _ in range(num_head_repeats)
+                        ]
+                        + [nn.Identity()]  # no bn after last depthwise conv
+                    )
+                    for _ in range(5)
+                ]
+            )
+
+        anchors_per_location = 9  # TODO: maybe allow to pass this arg?
+        self.cls_head_convs = make_head(num_classes * anchors_per_location)
+        self.cls_head_norms = make_head_norm()
+        self.box_head_convs = make_head(4 * anchors_per_location)
+        self.box_head_norms = make_head_norm()
+        self.num_classes = num_classes
+        self.num_head_repeats = num_head_repeats
+
+        patch_bn(self)
+        self._initialize_weights()
+        if match_tf_same_padding:
+            conv_to_same_conv(self)
+            maxpool_to_same_maxpool(self)
+
+    # Name from mmdetectin for convenience
+    def extract_features(self, x):
+        """Extract features from backbone + enchance with BiFPN"""
+        # don't use p2 and p1
+        p5, p4, p3, _, _ = self.encoder(x)
+        # coarser FPN levels
+        p6 = self.pyramid6(p5)
+        p7 = self.pyramid7(p6)
+        features = [p7, p6, p5, p4, p3]
+        # enhance features
+        features = self.bifpn(features)
+        # want features from lowest OS to highest to align with `generate_anchors_boxes` function
+        features = list(reversed(features))
+        return features
+
+    def forward(self, x):
+        features = self.extract_features(x)
+        class_outputs = []
+        box_outputs = []
+        for feat, (cls_bns, box_bns) in zip(features, zip(self.cls_head_norms, self.box_head_norms)):
+            cls_feat, box_feat = feat, feat
+            # it looks like that with drop_connect there is an additional residual here
+            # TODO: need to investigate using pretrained weights
+            for cls_conv, cls_bn in zip(self.cls_head_convs, cls_bns):
+                cls_feat = cls_bn(cls_conv(cls_feat))
+            for box_conv, box_bn in zip(self.box_head_convs, box_bns):
+                box_feat = box_bn(box_conv(box_feat))
+
+            box_feat = box_feat.permute(0, 2, 3, 1)
+            box_outputs.append(box_feat.contiguous().view(box_feat.shape[0], -1, 4))
+
+            cls_feat = cls_feat.permute(0, 2, 3, 1)
+            class_outputs.append(cls_feat.contiguous().view(cls_feat.shape[0], -1, self.num_classes))
+
+        class_outputs = torch.cat(class_outputs, 1)
+        box_outputs = torch.cat(box_outputs, 1)
+        # my anchors are in [x1, y1, x2,y2] format while pretrained weights are in [y1, x1, y2, x2] format
+        # it may be confusing to reorder x and y every time later so I do it once here. it gives
+        # compatability with pretrained weigths from Google and doesn't affect training from scratch
+        # box_outputs = box_outputs[..., [1, 0, 3, 2]]  # TODO: return back
+        return class_outputs, box_outputs
+
+    @torch.no_grad()
+    def predict(self, x):
+        """Run forward on given images and decode raw prediction into bboxes
+        Returns: bboxes, scores, classes
+        """
+        class_outputs, box_outputs = self.forward(x)
+        anchors = box_utils.generate_anchors_boxes(x.shape[-2:])[0]
+        return box_utils.decode(class_outputs, box_outputs, anchors)
+
+    def _initialize_weights(self):
+        # init everything except encoder
+        no_encoder_m = [m for n, m in self.named_modules() if not "encoder" in n]
+        initialize_iterator(no_encoder_m)
+        # need to init last bias so that after sigmoid it's 0.01
+        cls_bias_init = -torch.log(torch.tensor((1 - 0.01) / 0.01))  # -4.59
+        nn.init.constant_(self.cls_head_convs[-1][1].bias, cls_bias_init)
+
+
+PRETRAIN_SETTINGS = {**DEFAULT_IMAGENET_SETTINGS, "input_size": (512, 512), "crop_pct": 1, "num_classes": 90}
+
+# fmt: off
+CFGS = {
+  "efficientdet_d0": {
+    "default": {
+      "params": {
+        "encoder_name":"efficientnet_b0",
+        "pyramid_channels":64,
+        "num_fpn_layers":3,
+        "num_head_repeats":3,
+      },
+      **PRETRAIN_SETTINGS,
+    },
+    "coco": {"url": "https://github.com/bonlime/pytorch-tools/releases/download/v0.1.5/efficientdet-d0.pth",},
+  },
+  "efficientdet_d1": {
+    "default": {
+      "params": {
+        "encoder_name":"efficientnet_b1",
+        "pyramid_channels":88,
+        "num_fpn_layers":4,
+        "num_head_repeats":3,
+      },
+      **PRETRAIN_SETTINGS,
+      "input_size": (640, 640),
+    },
+    "coco": {"url": "https://github.com/bonlime/pytorch-tools/releases/download/v0.1.5/efficientdet-d1.pth",},
+  },
+  "efficientdet_d2": {
+    "default": {
+      "params": {
+        "encoder_name":"efficientnet_b2",
+        "pyramid_channels":112,
+        "num_fpn_layers":5,
+        "num_head_repeats":3,
+      },
+      **PRETRAIN_SETTINGS,
+      "input_size": (768, 768),
+    },
+    "coco": {"url": "https://github.com/bonlime/pytorch-tools/releases/download/v0.1.5/efficientdet-d2.pth",},
+  },
+  "efficientdet_d3": {
+    "default": {
+      "params": {
+        "encoder_name":"efficientnet_b3",
+        "pyramid_channels":160,
+        "num_fpn_layers":6,
+        "num_head_repeats":4,
+      },
+      **PRETRAIN_SETTINGS,
+      "input_size": (896, 896),
+    },
+    "coco": {"url": "https://github.com/bonlime/pytorch-tools/releases/download/v0.1.5/efficientdet-d3.pth",},
+  },
+  "efficientdet_d4": {
+    "default": {
+      "params": {
+        "encoder_name":"efficientnet_b4",
+        "pyramid_channels":224,
+        "num_fpn_layers":7,
+        "num_head_repeats":4,
+      },
+      **PRETRAIN_SETTINGS,
+      "input_size": (1024, 1024),
+    },
+    "coco": {"url": "https://github.com/bonlime/pytorch-tools/releases/download/v0.1.5/efficientdet-d4.pth",},
+  },
+  "efficientdet_d5": {
+    "default": {
+      "params": {
+        "encoder_name":"efficientnet_b5",
+        "pyramid_channels":288,
+        "num_fpn_layers":7,
+        "num_head_repeats":4,
+      },
+      **PRETRAIN_SETTINGS,
+      "input_size": (1280, 1280),
+    },
+    "coco": {"url": "https://github.com/bonlime/pytorch-tools/releases/download/v0.1.5/efficientdet-d5.pth",},
+  },
+  "efficientdet_d6": {
+    "default": {
+      "params": {
+        "encoder_name":"efficientnet_b6",
+        "pyramid_channels":384,
+        "num_fpn_layers":8,
+        "num_head_repeats":5,
+      },
+      **PRETRAIN_SETTINGS,
+      "input_size": (1280, 1280),
+    },
+    "coco": {"url": "https://github.com/bonlime/pytorch-tools/releases/download/v0.1.5/efficientdet-d6.pth",},
+  },
+}
+# fmt: on
+
+
+def _efficientdet(arch, pretrained=None, **kwargs):
+    cfgs = deepcopy(CFGS)
+    cfg_settings = cfgs[arch]["default"]
+    cfg_params = cfg_settings.pop("params")
+    kwargs.update(cfg_params)
+    model = EfficientDet(**kwargs)
+    if pretrained:
+        state_dict = load_state_dict_from_url(cfgs[arch][pretrained]["url"])
+        kwargs_cls = kwargs.get("num_classes", None)
+        if kwargs_cls and kwargs_cls != cfg_settings["num_classes"]:
+            logging.warning(
+                f"Using model pretrained for {cfg_settings['num_classes']} classes with {kwargs_cls} classes. Last layer is initialized randomly"
+            )
+            last_conv_name = f"cls_head_convs.{kwargs['num_head_repeats']}.1"
+            state_dict[f"{last_conv_name}.weight"] = model.state_dict()[f"{last_conv_name}.weight"]
+            state_dict[f"{last_conv_name}.bias"] = model.state_dict()[f"{last_conv_name}.bias"]
+        model.load_state_dict(state_dict)
+    setattr(model, "pretrained_settings", cfg_settings)
+    return model
+
+
+@wraps(EfficientDet)
+def efficientdet_d0(pretrained="coco", **kwargs):
+    return _efficientdet("efficientdet_d0", pretrained, **kwargs)
+
+
+@wraps(EfficientDet)
+def efficientdet_d1(pretrained="coco", **kwargs):
+    return _efficientdet("efficientdet_d1", pretrained, **kwargs)
+
+
+@wraps(EfficientDet)
+def efficientdet_d2(pretrained="coco", **kwargs):
+    return _efficientdet("efficientdet_d2", pretrained, **kwargs)
+
+
+@wraps(EfficientDet)
+def efficientdet_d3(pretrained="coco", **kwargs):
+    return _efficientdet("efficientdet_d3", pretrained, **kwargs)
+
+
+@wraps(EfficientDet)
+def efficientdet_d4(pretrained="coco", **kwargs):
+    return _efficientdet("efficientdet_d4", pretrained, **kwargs)
+
+
+@wraps(EfficientDet)
+def efficientdet_d5(pretrained="coco", **kwargs):
+    return _efficientdet("efficientdet_d5", pretrained, **kwargs)
+
+
+@wraps(EfficientDet)
+def efficientdet_d6(pretrained="coco", **kwargs):
+    return _efficientdet("efficientdet_d6", pretrained, **kwargs)
+
+
+# No B7 because it's the same model as B6 but with larger input