fix precise BN

Summary: It actually did not run

Reviewed By: rbgirshick

Differential Revision: D17900284

fbshipit-source-id: cf9ae95581f0948b3d2ff13e113ea2146d284f93

Author: ppwwyyxx

detectron2/engine/hooks.py

@@ -388,13 +388,14 @@ def update_stats(self):
 
         def data_loader():
             nonlocal num_iter
-            num_iter += 1
-            if num_iter % 100 == 0:
-                self._logger.info(
-                    "Running precise-BN ... {}/{} iterations.".format(num_iter, self._num_iter)
-                )
-            # This way we can reuse the same iterator
-            yield next(self._data_iter)
+            while True:
+                num_iter += 1
+                if num_iter % 100 == 0:
+                    self._logger.info(
+                        "Running precise-BN ... {}/{} iterations.".format(num_iter, self._num_iter)
+                    )
+                # This way we can reuse the same iterator
+                yield next(self._data_iter)
 
         with EventStorage():  # capture events in a new storage to discard them
             self._logger.info(

docs/conf.py

@@ -255,14 +255,14 @@ def autodoc_skip_member(app, what, name, obj, skip, options):
 
 
 def url_resolver(url):
-    if '.html' not in url:
-        url = url.replace('../', '')
+    if ".html" not in url:
+        url = url.replace("../", "")
         return "https://github.com/facebookresearch/detectron2/blob/master/" + url
     else:
         if DEPLOY:
             return "http://detectron2.readthedocs.io/" + url
         else:
-            return '/' + url
+            return "/" + url
 
 
 def setup(app):
@@ -272,7 +272,8 @@ def setup(app):
     # app.connect('autodoc-skip-member', autodoc_skip_member)
     app.add_config_value(
         "recommonmark_config",
-        {   "url_resolver": url_resolver,
+        {
+            "url_resolver": url_resolver,
             "auto_toc_tree_section": "Contents",
             "enable_math": True,
             "enable_inline_math": True,