set the environment variable "MS_GRAPH_KERNEL_FLAGS" to deprecated

docs/api/api_python/mindspore/mindspore.context.txt

@@ -160,8 +160,7 @@ set_context(**kwargs)
 
             - dump_as_text：将详细信息转储为文本文件。默认值：False。
 
-            有关更多选项，可以参考实现代码。这些选项也可以通过环境变量MS_GRAPH_KERNEL_FLAGS设置，而无需修改网络源代码。
-            例如，导出MS_GRAPH_KERNEL_FLAGS="--opt_level=2 --dump_as_text"。
+            有关更多选项，可以参考实现代码。
         enable_reduce_precision (bool)：表示是否开启降低精度计算。默认值：True。
             设置为True时，不支持用户指定的精度，且精度将自动更改。
             设置为False时，如果未指定用例的精度，则会报错并退出。
@@ -217,4 +216,4 @@ set_context(**kwargs)
         >>> context.set_context(grad_for_scalar=True)
         >>> context.set_context(save_compile_cache=True)
         >>> context.set_context(load_compile_cache=True)
-        >>> context.set_context(pynative_synchronize=True)
+        >>> context.set_context(pynative_synchronize=True)

mindspore/ccsrc/utils/context/graph_kernel_flags.cc

@@ -150,11 +150,19 @@ class FlagRegister {
 }  // namespace
 
 std::pair<std::string, bool> GraphKernelFlags::GetGraphKernelContext() {
-  // Use the environment variable in priority and not in lite
+  // This environment variable is deprecated.
   auto env_flags = std::getenv("MS_GRAPH_KERNEL_FLAGS");
-  std::string flags = env_flags ? std::string(env_flags) : "";
+  bool use_env = (env_flags != nullptr);
+  std::string flags = use_env ? std::string(env_flags) : "";
   bool enable_context{false};
 #ifndef MSLITE_ENABLE_GRAPH_KERNEL
+  static bool print_warning = true;
+  if (use_env && print_warning) {
+    print_warning = false;
+    MS_LOG(WARNING) << "The environment variable \"MS_GRAPH_KERNEL_FLAGS\" is deprecated from version 1.6 "
+                    << "and will be removed in a future version, "
+                    << "use context \"graph_kernel_flags\" instead.";
+  }
   auto context = MsContext::GetInstance();
   MS_EXCEPTION_IF_NULL(context);
   if (flags.empty()) {

mindspore/context.py

@@ -741,9 +741,7 @@ def set_context(**kwargs):
 
             - dump_as_text: dump detail info as text files. Default: false.
 
-            More options can refer to the implementation code. These options can also be set by environment
-            variable MS_GRAPH_KERNEL_FLAGS, without modifying network source code.
-            For example, export MS_GRAPH_KERNEL_FLAGS="--opt_level=2 --dump_as_text".
+            More options can refer to the implementation code.
         enable_reduce_precision (bool): Whether to enable precision reduction.
             If the operator does not support the user-specified precision, the precision will
             be changed automatically. Default: True.