FrozenGene commented on a change in pull request #4990: [TF][Relay] BatchNorm 
support with run-time mean and variance calculation
URL: https://github.com/apache/incubator-tvm/pull/4990#discussion_r388917594
 
 

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 File path: tests/python/frontend/tensorflow/test_bn_dynamic.py
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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""
+BatchNorm without given mean and variance given testcases
+====================
+This is a test script to test fused_batch_norm operators
+in TensorFlow frontend when mean and variance are not given.
+"""
+import tvm
+import numpy as np
+import tensorflow as tf
+from tvm import relay
+from tensorflow.python.framework import graph_util
+
+def test_fused_batch_norm():
+    g = tf.Graph()
+    with g.as_default():
+        input_tensor = tf.placeholder(tf.float32, shape=(1, 12, 12, 32), 
name='input')
+        alpha = tf.constant(np.random.rand(32,), dtype=tf.float32, 
name='alpha')
+        beta = tf.constant(np.random.rand(32,), dtype=tf.float32, name='beta')
+        bn = tf.nn.fused_batch_norm(x=input_tensor, offset=beta, scale=alpha, 
name='bn')
+        out = tf.identity(bn[0], name='output')
+    data = np.random.rand(1, 12, 12, 32)
+    with tf.Session(graph=out.graph) as sess:
+        sess.run([tf.global_variables_initializer()])
+        tf_out = sess.run(out, feed_dict={input_tensor:data})
+        constant_graph = graph_util.convert_variables_to_constants(sess, 
sess.graph_def, ['output'])
+
+    for device in ["llvm"]:
+        ctx = tvm.context(device, 0)
+        if not ctx.exist:
+            print("Skip because %s is not enabled" % device)
+            continue
+        layout = None
+        mod, params = relay.frontend.from_tensorflow(constant_graph, 
layout=layout, outputs=['output'])
 
 Review comment:
   I think `layout = None` is unnecessary. Because for CPU, we use the default 
`NHWC` layout is enough. The `layout` is used when we have `convolution` ops, 
which will be `NCHW`  better if target is `GPU`. 

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