From 8db945a90560c2c4b550e7caa97333cdd2ebde3e Mon Sep 17 00:00:00 2001
From: Chen Long <1300851984@qq.com>
Date: Mon, 19 Jul 2021 20:18:24 +0800
Subject: [PATCH] Update while loop (#34229)

* update readme test=document_fix

* update while loop docs test=document_fix
---
 python/paddle/fluid/layers/control_flow.py | 32 ++++++----------------
 1 file changed, 8 insertions(+), 24 deletions(-)

diff --git a/python/paddle/fluid/layers/control_flow.py b/python/paddle/fluid/layers/control_flow.py
index 3a06b84d111..fff65f9f46e 100755
--- a/python/paddle/fluid/layers/control_flow.py
+++ b/python/paddle/fluid/layers/control_flow.py
@@ -1133,30 +1133,14 @@ def while_loop(cond, body, loop_vars, is_test=False, name=None):
             refer to :ref:`api_guide_Name`. Default is None.
 
     Returns:
-        A list or tuple of tensors or LoDTensorArrays which returned by ``body`` .
-    
-    Returen type:
-        list(Variable)|tuple(Variable).
-
-    Raises:
-        TypeError: If the type of ``cond`` is not callable.
-        TypeError: If the type of ``body`` is not callable.
-        TypeError: If the type of ``loop_vars`` is not list or tuple.
-        TypeError: If the type of ``cond`` returns is not Variable.
-        TypeError: If the type of ``cond`` returns is not a boolean variable.
-        TypeError: If the shape of ``cond`` returns is not equals 1.
-        ValueError: If the ``var_loops`` is empty.
-        ValueError: If the length or type of ``body`` returns is not same as ``loop_vars``.
+        A list or tuple of Tensors or LoDTensorArrays which returned by ``body`` .
 
     Examples:
         .. code-block:: python
 
-            import paddle.fluid as fluid
-            import paddle.fluid.layers as layers
             import paddle
             paddle.enable_static()
 
-
             def cond(i, ten):
                 return i < ten
 
@@ -1164,14 +1148,14 @@ def while_loop(cond, body, loop_vars, is_test=False, name=None):
                 i = i + 1
                 return [i, ten]
 
-            main_program = fluid.default_main_program()
-            startup_program = fluid.default_startup_program()
-            with fluid.program_guard(main_program, startup_program):
-                i = layers.fill_constant(shape=[1], dtype='int64', value=0)     # loop counter
-                ten = layers.fill_constant(shape=[1], dtype='int64', value=10)  # loop length
-                i, ten = layers.while_loop(cond, body, [i, ten])
+            main_program = paddle.static.default_main_program()
+            startup_program = paddle.static.default_startup_program()
+            with paddle.static.program_guard(main_program, startup_program):
+                i = paddle.full(shape=[1], fill_value=0, dtype='int64')     # loop counter
+                ten = paddle.full(shape=[1], fill_value=10, dtype='int64')  # loop length
+                i, ten = paddle.static.nn.while_loop(cond, body, [i, ten])
                 
-                exe = fluid.Executor(fluid.CPUPlace())
+                exe = paddle.static.Executor(paddle.CPUPlace())
                 res = exe.run(main_program, feed={}, fetch_list=[i])
                 print(res) # [array([10])]
     """
-- 
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