【Hackathon No.89】 Remove circle import Part1 (#50677)

* modify the 'import' position

* rollback

* move 'from paddle.fluid.io import save_inference_model' to head of api.py

Author: Liyulingyue

python/paddle/jit/api.py

@@ -73,6 +73,7 @@
 )
 from paddle.fluid.framework import dygraph_only, _non_static_mode
 from paddle.fluid.wrapped_decorator import wrap_decorator
+from paddle.fluid.io import save_inference_model
 
 
 def create_program_from_desc(program_desc):
@@ -1159,8 +1160,6 @@ def fun(inputs):
         )
 
         # 5. save inference model
-        from paddle.fluid.io import save_inference_model
-
         # construct new save_inference_model arguments
         model_path = dirname
         # NOTE(chenweihang): because prefix contains model and params filename,
@@ -1817,8 +1816,6 @@ def forward(self, input):
         if dirname and not os.path.exists(dirname):
             os.makedirs(dirname)
 
-        from paddle.fluid.io import save_inference_model
-
         def get_feed_fetch(all_vars, partial_vars):
             if partial_vars is None:
                 return all_vars