Add date and time to the codec file path so that the file doesn't get overridden with each run (#4303)

Summary:
Pull Request resolved: https://github.com/facebookresearch/faiss/pull/4303

Add date and time to the codec file path so that the file doesn't get overridden with each run

Reviewed By: junjieqi

Differential Revision: D73419533

fbshipit-source-id: 289875f07c5037e40921ae3a8bfcb339bee1131c

benchs/bench_fw/descriptors.py

@@ -113,6 +113,8 @@ class DatasetDescriptor:
     # desc_name
     desc_name: Optional[str] = None
 
+    filename_suffix: Optional[str] = None
+
     normalize_L2: bool = False
 
     def __hash__(self):
@@ -138,6 +140,8 @@ class DatasetDescriptor:
             ).replace("=", "_").replace("/", "_")
         if self.num_vectors is not None:
             filename += f"_{self.num_vectors}"
+        if self.filename_suffix is not None:
+            filename += f"_{self.filename_suffix}"
         filename += "."
 
         self.desc_name = filename