[refactor] Import ABC from collections.abc for Python 3.10 compatibility

mmf/common/report.py

@@ -98,7 +98,7 @@ def apply_fn(self, fn: Callable, fields: Optional[List[str]] = None):
                 if key not in fields:
                     continue
             self[key] = fn(self[key])
-            if isinstance(self[key], collections.MutableSequence):
+            if isinstance(self[key], collections.abc.MutableSequence):
                 for idx, item in enumerate(self[key]):
                     self[key][idx] = fn(item)
             elif isinstance(self[key], dict):

mmf/common/sample.py

@@ -424,7 +424,7 @@ def convert_batch_to_sample_list(
 def to_device(
     sample_list: Union[SampleList, Dict[str, Any]], device: device_type = "cuda"
 ) -> SampleList:
-    if isinstance(sample_list, collections.Mapping):
+    if isinstance(sample_list, collections.abc.Mapping):
         sample_list = convert_batch_to_sample_list(sample_list)
     # to_device is specifically for SampleList
     # if user is passing something custom built

mmf/models/transformers/heads/utils.py

@@ -147,10 +147,10 @@ def _process_head_output(
         head_name: str,
         sample_list: Dict[str, Tensor],
     ) -> Dict[str, Tensor]:
-        if isinstance(outputs, collections.MutableMapping) and "losses" in outputs:
+        if isinstance(outputs, collections.abc.MutableMapping) and "losses" in outputs:
             return outputs
 
-        if isinstance(outputs, collections.MutableMapping) and "scores" in outputs:
+        if isinstance(outputs, collections.abc.MutableMapping) and "scores" in outputs:
             logits = outputs["scores"]
         else:
             logits = outputs

mmf/utils/logger.py

@@ -1,6 +1,6 @@
 # Copyright (c) Facebook, Inc. and its affiliates.
 
-import collections
+import collections.abc
 import functools
 import json
 import logging
@@ -288,7 +288,7 @@ def log_progress(info: Union[Dict, Any], log_format="simple"):
     caller, key = _find_caller()
     logger = logging.getLogger(caller)
 
-    if not isinstance(info, collections.Mapping):
+    if not isinstance(info, collections.abc.Mapping):
         logger.info(info)
 
     if log_format == "simple":