update api doc of save_graphs_path

mindspore/context.py

@@ -40,6 +40,7 @@ _DEVICE_APP_MEMORY_SIZE = 31 # The max memory size of graph plus variable.
 _re_pattern = r'[1-9][0-9]*(\.)?[0-9]*GB|0\.[0-9]*GB'
 _k_context = None
 
+
 def _make_directory(path):
     """Make directory."""
     real_path = None
@@ -432,6 +433,7 @@ def set_auto_parallel_context(**kwargs):
     """
     _set_auto_parallel_context(**kwargs)
 
+
 def get_auto_parallel_context(attr_key):
     """
     Gets auto parallel context attribute value according to the key.
@@ -542,7 +544,13 @@ def set_context(**kwargs):
         device_id (int): ID of the target device, the value must be in [0, device_num_per_host-1],
                     while device_num_per_host should be no more than 4096. Default: 0.
         save_graphs (bool): Whether to save graphs. Default: False.
-        save_graphs_path (str): Path to save graphs. Default: "."
+        save_graphs_path (str): Path to save graphs. Default: ".".
+
+            If the program is executed in the parallel mode, `save_graphs_path` should consist of the path and the
+            current device id, to ensure that writing file conflicts won't happen when the different processes try to
+            create the files in the same directory. For example, the `device_id` can be generated by
+            `device_id = os.getenv("DEVICE_ID")` and the `save_graphs_path` can be set by
+            `context.set_context(save_graphs_path="path/to/ir/files"+device_id)`.
         enable_graph_kernel (bool): Whether to enable composition of basic primitives. These primitives would be
             compiled into a fused kernel automatically. Default: False.
         reserve_class_name_in_scope (bool) : Whether to save the network class name in the scope. Default: True.
@@ -700,6 +708,7 @@ class ParallelMode:
     AUTO_PARALLEL = "auto_parallel"
     MODE_LIST = [STAND_ALONE, DATA_PARALLEL, HYBRID_PARALLEL, SEMI_AUTO_PARALLEL, AUTO_PARALLEL]
 
+
 @args_type_check(enable_ps=bool)
 def set_ps_context(**kwargs):
     """
@@ -750,6 +759,7 @@ def get_ps_context(attr_key):
     """
     return _get_ps_context(attr_key)
 
+
 def reset_ps_context():
     """
     Reset parameter server training mode context attributes to the default values: