Remove left mmdet dependency (#3488)

src/otx/algo/detection/backbones/pytorchcv_backbones.py

@@ -6,10 +6,8 @@
 from __future__ import annotations
 
 from pathlib import Path
-from typing import TYPE_CHECKING
 
 import torch
-from mmdet.registry import MODELS
 from pytorchcv.model_provider import _models
 from pytorchcv.models.model_store import download_model
 from torch import distributed, nn
@@ -19,9 +17,6 @@
 from otx.algo.modules.norm import build_norm_layer
 from otx.algo.utils.mmengine_utils import get_dist_info
 
-if TYPE_CHECKING:
-    from mmdet.registry import Registry
-
 # ruff: noqa: SLF001
 
 
@@ -99,32 +94,25 @@ def init_weights(self: nn.Module, pretrained: bool = True) -> None:
             download_model(net=self, model_name=self.model_name, local_model_store_dir_path=self.models_cache_root)
 
 
-ori_build_func = MODELS.build_func
-
-
 def _pytorchcv_model_reduce(self) -> nn.Module:  # noqa: ANN001
     return (_build_model_including_pytorchcv, (self.otx_cfg,))
 
 
 def _build_model_including_pytorchcv(
     cfg: dict,
-    registry: Registry = MODELS,
     default_args: dict | None = None,
 ) -> nn.Module:
-    """Try to build model from mmdet first and build from pytorchcv."""
-    try:
-        model = ori_build_func(cfg, registry, default_args)
-    except KeyError:  # build from pytorchcv
-        args = cfg.copy()
-        if default_args is not None:
-            for name, value in default_args.items():
-                args.setdefault(name, value)
+    """Build model from pytorchcv."""
+    args = cfg.copy()
+    if default_args is not None:
+        for name, value in default_args.items():
+            args.setdefault(name, value)
 
-        model = _build_pytorchcv_model(**args)
+    model = _build_pytorchcv_model(**args)
 
-        # support pickle
-        model.otx_cfg = args
-        model.__class__.__reduce__ = _pytorchcv_model_reduce.__get__(model, model.__class__)
+    # support pickle
+    model.otx_cfg = args
+    model.__class__.__reduce__ = _pytorchcv_model_reduce.__get__(model, model.__class__)
 
     return model
 
@@ -175,6 +163,3 @@ def _build_pytorchcv_model(
         )
 
     return model
-
-
-MODELS.build_func = _build_model_including_pytorchcv