Revert "Disable in_place in batch_norm API. (#12736)"

This reverts commit f5d5d7b2.

paddle/fluid/operators/batch_norm_op.cc

@@ -135,7 +135,7 @@ class BatchNormOpMaker : public framework::OpProtoAndCheckerMaker {
     AddInput("Variance",
              "The global variance (for training) "
              "or estimated Variance (for testing)");
-    AddOutput("Y", "result after normalization");
+    AddOutput("Y", "result after normalization").Reuse("X");
     AddOutput("MeanOut",
               "Share memory with Mean. "
               "Store the global mean when training")

python/paddle/fluid/layers/nn.py

@@ -27,7 +27,6 @@ from . import utils
 import random
 from .. import unique_name
 from functools import reduce
-import warnings
 
 __all__ = [
     'fc',
@@ -2048,7 +2047,7 @@ def batch_norm(input,
         param_attr(ParamAttr): The parameter attribute for Parameter `scale`.
         bias_attr(ParamAttr): The parameter attribute for Parameter `bias`.
         data_layout(string, default NCHW): NCHW|NHWC
-        in_place(bool, Default False): This argument is deprecated since 0.15.0.
+        in_place(bool, Default False): Make the input and output of batch norm reuse memory.
         use_mkldnn(bool, Default false): ${use_mkldnn_comment}
         name(string, Default None): A name for this layer(optional). If set None, the layer
             will be named automatically.
@@ -2070,10 +2069,6 @@ def batch_norm(input,
     helper = LayerHelper('batch_norm', **locals())
     dtype = helper.input_dtype()
 
-    if in_place:
-        raise warnings.warn("The argument in_place is deprecated since 0.15.0, "
-                            "please do not set it True.")
-
     input_shape = input.shape
     if data_layout == 'NCHW':
         channel_num = input_shape[1]
@@ -2123,7 +2118,7 @@ def batch_norm(input,
     saved_mean = helper.create_tmp_variable(dtype=dtype, stop_gradient=True)
     saved_variance = helper.create_tmp_variable(dtype=dtype, stop_gradient=True)
 
-    batch_norm_out = helper.create_tmp_variable(dtype)
+    batch_norm_out = input if in_place else helper.create_tmp_variable(dtype)
 
     helper.append_op(
         type="batch_norm",

python/paddle/fluid/nets.py

@@ -229,7 +229,7 @@ def img_conv_group(input,
             use_mkldnn=use_mkldnn)
 
         if conv_with_batchnorm[i]:
-            tmp = layers.batch_norm(input=tmp, act=conv_act)
+            tmp = layers.batch_norm(input=tmp, act=conv_act, in_place=True)
             drop_rate = conv_batchnorm_drop_rate[i]
             if abs(drop_rate) > 1e-5:
                 tmp = layers.dropout(x=tmp, dropout_prob=drop_rate)

python/paddle/fluid/tests/book/test_image_classification.py

@@ -256,10 +256,7 @@ def main(net_type, use_cuda, is_local=True):
     save_dirname = "image_classification_" + net_type + ".inference.model"
 
     train(net_type, use_cuda, save_dirname, is_local)
-
-    # There is bug in fluid.InferenceTranspiler for VGG.
-    if net_type == "resnet":
-        infer(use_cuda, save_dirname)
+    infer(use_cuda, save_dirname)
 
 
 class TestImageClassification(unittest.TestCase):