Override num_workers from 0 to 1 in get_pytorch_dataloader

Summary: To support a similar interface to the pytorch dataloader, we set `num_workers` to 1 if the input `num_workers` is 0 in `get_pytorch_dataloader`

Differential Revision: D68357865

src/spdl/dataloader/_pytorch_dataloader.py

@@ -298,8 +298,13 @@ def get_pytorch_dataloader(
     if timeout is not None and timeout < 0:
         raise ValueError(f"`timeout` must be positive. Found: {timeout}.")
 
-    if num_workers < 1:
+    if num_workers < 0:
         raise ValueError(f"`num_workers` must be greater than 0. Found: {num_workers}")
+    elif num_workers == 0:
+        _LG.warning(
+            "`num_workers` is 0. Setting `num_workers` to 1 for single process dataloading."
+        )
+        num_workers = 1
 
     buffer_size = prefetch_factor * num_workers