Add --noplots flag to suppress figures and images logging (#7534)

* support nomedia

* support nomedia for validation

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update train.py

* Revert no plot evolve

evolve plots do not contain any images

* Revert plot_results

contains no media

* Update wandb_utils.py

* sync-bn cleanup

* Cleanup

* Rename nomedia -> noplots

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

utils/loggers/__init__.py

@@ -99,11 +99,11 @@ class Loggers():
         if self.wandb:
             self.wandb.log({"Labels": [wandb.Image(str(x), caption=x.name) for x in paths]})
 
-    def on_train_batch_end(self, ni, model, imgs, targets, paths, plots, sync_bn):
+    def on_train_batch_end(self, ni, model, imgs, targets, paths, plots):
         # Callback runs on train batch end
         if plots:
             if ni == 0:
-                if not sync_bn:  # tb.add_graph() --sync known issue https://github.com/ultralytics/yolov5/issues/3754
+                if not self.opt.sync_bn:  # --sync known issue https://github.com/ultralytics/yolov5/issues/3754
                     with warnings.catch_warnings():
                         warnings.simplefilter('ignore')  # suppress jit trace warning
                         self.tb.add_graph(torch.jit.trace(de_parallel(model), imgs[0:1], strict=False), [])