Remove gt_boxes, seems no longer used?

Summary: Remove code that seems redundant.

Reviewed By: rbgirshick

Differential Revision: D8200163

fbshipit-source-id: c3096c77a1c6b33eab5dc0ceb9414f3bdbbf71e9

detectron/roi_data/rpn.py

@@ -89,12 +89,6 @@ def add_rpn_blobs(blobs, im_scales, roidb):
             (entry['gt_classes'] > 0) & (entry['is_crowd'] == 0)
         )[0]
         gt_rois = entry['boxes'][gt_inds, :] * scale
-        # TODO(rbg): gt_boxes is poorly named;
-        # should be something like 'gt_rois_info'
-        gt_boxes = blob_utils.zeros((len(gt_inds), 6))
-        gt_boxes[:, 0] = im_i  # batch inds
-        gt_boxes[:, 1:5] = gt_rois
-        gt_boxes[:, 5] = entry['gt_classes'][gt_inds]
         im_info = np.array([[im_height, im_width, scale]], dtype=np.float32)
         blobs['im_info'].append(im_info)