add version_ prefix to log_dir (#706)

* add version_ prefix to log_dir

* add version_ prefix

pytorch_lightning/logging/tensorboard.py

@@ -63,7 +63,7 @@ class TensorBoardLogger(LightningLoggerBase):
 
         root_dir = os.path.join(self.save_dir, self.name)
         os.makedirs(root_dir, exist_ok=True)
-        log_dir = os.path.join(root_dir, str(self.version))
+        log_dir = os.path.join(root_dir, "version_" + str(self.version))
         self._experiment = SummaryWriter(log_dir=log_dir, **self.kwargs)
         return self._experiment
 
@@ -131,9 +131,11 @@ class TensorBoardLogger(LightningLoggerBase):
 
     def _get_next_version(self):
         root_dir = os.path.join(self.save_dir, self.name)
-        existing_versions = [
-            int(d) for d in os.listdir(root_dir) if os.path.isdir(os.path.join(root_dir, d)) and d.isdigit()
-        ]
+        existing_versions = []
+        for d in os.listdir(root_dir):
+            if os.path.isdir(os.path.join(root_dir, d)) and d.startswith("version_"):
+                existing_versions.append(int(d.split("_")[1]))
+
         if len(existing_versions) == 0:
             return 0
         else:

tests/test_logging.py

@@ -296,8 +296,8 @@ def test_tensorboard_automatic_versioning(tmpdir):
     """Verify that automatic versioning works"""
 
     root_dir = tmpdir.mkdir("tb_versioning")
-    root_dir.mkdir("0")
-    root_dir.mkdir("1")
+    root_dir.mkdir("version_0")
+    root_dir.mkdir("version_1")
 
     logger = TensorBoardLogger(save_dir=tmpdir, name="tb_versioning")
 
@@ -308,9 +308,9 @@ def test_tensorboard_manual_versioning(tmpdir):
     """Verify that manual versioning works"""
 
     root_dir = tmpdir.mkdir("tb_versioning")
-    root_dir.mkdir("0")
-    root_dir.mkdir("1")
-    root_dir.mkdir("2")
+    root_dir.mkdir("version_0")
+    root_dir.mkdir("version_1")
+    root_dir.mkdir("version_2")
 
     logger = TensorBoardLogger(save_dir=tmpdir, name="tb_versioning", version=1)