Add Faster R-CNN R50-FPN COCO weights for TTA harness

README.md

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+---
+license: apache-2.0
+tags:
+  - object-detection
+  - test-time-adaptation
+  - faster-rcnn
+  - coco
+---
+# TTA-COCO-FasterRCNN-R50
+
+Faster R-CNN ResNet-50-FPN trained on COCO (91-class id space), re-hosted for the
+TTA-Evaluation-Harness as the two-stage detection source model (sibling of
+`WNJXYK/TTA-COCO-DETR-R50`).
+
+`model.safetensors` is the torchvision `fasterrcnn_resnet50_fpn` COCO `state_dict`
+(`FasterRCNN_ResNet50_FPN_Weights.DEFAULT`, Apache-2.0). The harness loads it into
+a real-`BatchNorm2d` backbone (`weights_backbone=None`, `strict=False`) so BN-based
+test-time adaptation has a genuine adaptation surface. Pinned by `revision: v1.0`.

model.safetensors

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