add support for hjson config files (#2783)

Co-authored-by: NOlatunji Ruwase <olruwase@microsoft.com>

deepspeed/runtime/config.py

@@ -7,6 +7,7 @@ from typing import Union
 
 import torch
 import json
+import hjson
 import copy
 import base64
 
@@ -705,14 +706,14 @@ class DeepSpeedConfig(object):
         if isinstance(config, dict):
             self._param_dict = config
         elif os.path.exists(config):
-            self._param_dict = json.load(
+            self._param_dict = hjson.load(
                 open(config,
                      "r"),
                 object_pairs_hook=dict_raise_error_on_duplicate_keys)
         else:
             try:
                 config_decoded = base64.urlsafe_b64decode(config).decode('utf-8')
-                self._param_dict = json.loads(config_decoded)
+                self._param_dict = hjson.loads(config_decoded)
             except (UnicodeDecodeError, AttributeError):
                 raise ValueError(
                     f"Expected a string path to an existing deepspeed config, or a dictionary or a valid base64. Received: {config}"

tests/unit/runtime/test_ds_config_dict.py

 # A test on its own
+import os
 import torch
 import pytest
 import json
+import hjson
 import argparse
 
 from deepspeed.runtime.zero.config import DeepSpeedZeroConfig
@@ -158,11 +160,41 @@ def test_get_bfloat16_enabled(bf16_key):
     assert get_bfloat16_enabled(cfg) == True
 
 
+class TestConfigLoad(DistributedTest):
+    world_size = 1
+
+    def test_dict(self, base_config):
+        hidden_dim = 10
+        model = SimpleModel(hidden_dim)
+        model, _, _, _ = deepspeed.initialize(config=base_config,
+                                              model=model,
+                                              model_parameters=model.parameters())
+
+    def test_json(self, base_config, tmpdir):
+        config_path = os.path.join(tmpdir, "config.json")
+        with open(config_path, 'w') as fp:
+            json.dump(base_config, fp)
+        hidden_dim = 10
+        model = SimpleModel(hidden_dim)
+        model, _, _, _ = deepspeed.initialize(config=config_path,
+                                              model=model,
+                                              model_parameters=model.parameters())
+
+    def test_hjson(self, base_config, tmpdir):
+        config_path = os.path.join(tmpdir, "config.json")
+        with open(config_path, 'w') as fp:
+            hjson.dump(base_config, fp)
+        hidden_dim = 10
+        model = SimpleModel(hidden_dim)
+        model, _, _, _ = deepspeed.initialize(config=config_path,
+                                              model=model,
+                                              model_parameters=model.parameters())
+
+
 class TestDeprecatedDeepScaleConfig(DistributedTest):
     world_size = 1
 
     def test(self, base_config, tmpdir):
-
         config_path = create_config_from_dict(tmpdir, base_config)
         parser = argparse.ArgumentParser()
         args = parser.parse_args(args='')