Add nms and agnostic nms to export.py (#5938)

* add nms and agnostic nms to export.py

* fix agnostic implies nms

* reorder args to group TF args

* PEP8 120 char

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

export.py

         opset=14,  # ONNX: opset version
         verbose=False,  # TensorRT: verbose log
         workspace=4,  # TensorRT: workspace size (GB)
+        nms=False,  # TF: add NMS to model
+        agnostic_nms=False,  # TF: add agnostic NMS to model
         topk_per_class=100,  # TF.js NMS: topk per class to keep
         topk_all=100,  # TF.js NMS: topk for all classes to keep
         iou_thres=0.45,  # TF.js NMS: IoU threshold
     if any(tf_exports):
         pb, tflite, tfjs = tf_exports[1:]
         assert not (tflite and tfjs), 'TFLite and TF.js models must be exported separately, please pass only one type.'
-        model = export_saved_model(model, im, file, dynamic, tf_nms=tfjs, agnostic_nms=tfjs,
-                                   topk_per_class=topk_per_class, topk_all=topk_all, conf_thres=conf_thres,
-                                   iou_thres=iou_thres)  # keras model
+        model = export_saved_model(model, im, file, dynamic, tf_nms=nms or agnostic_nms or tfjs,
+                                   agnostic_nms=agnostic_nms or tfjs, topk_per_class=topk_per_class, topk_all=topk_all,
+                                   conf_thres=conf_thres, iou_thres=iou_thres)  # keras model
         if pb or tfjs:  # pb prerequisite to tfjs
             export_pb(model, im, file)
         if tflite:
     parser.add_argument('--opset', type=int, default=14, help='ONNX: opset version')
     parser.add_argument('--verbose', action='store_true', help='TensorRT: verbose log')
     parser.add_argument('--workspace', type=int, default=4, help='TensorRT: workspace size (GB)')
+    parser.add_argument('--nms', action='store_true', help='TF: add NMS to model')
+    parser.add_argument('--agnostic-nms', action='store_true', help='TF: add agnostic NMS to model')
     parser.add_argument('--topk-per-class', type=int, default=100, help='TF.js NMS: topk per class to keep')
     parser.add_argument('--topk-all', type=int, default=100, help='TF.js NMS: topk for all classes to keep')
     parser.add_argument('--iou-thres', type=float, default=0.45, help='TF.js NMS: IoU threshold')