From 9ecd568e8365cdc9ba8df2f43475519bcbfdaa8c Mon Sep 17 00:00:00 2001
From: jiangjiajun <jiangjiajun@baidu.com>
Date: Wed, 4 Sep 2019 12:05:07 +0800
Subject: [PATCH] add merge batch_norm optimization

---
 x2paddle/convert.py                |   1 +
 x2paddle/optimizer/tf_optimizer.py | 127 +++++++++++++++++++++++++++++
 2 files changed, 128 insertions(+)

diff --git a/x2paddle/convert.py b/x2paddle/convert.py
index 9642fcc..673c9f2 100644
--- a/x2paddle/convert.py
+++ b/x2paddle/convert.py
@@ -106,6 +106,7 @@ def tf2paddle(model_path,
         # optimizer below is experimental
         optimizer.merge_activation()
         optimizer.merge_bias()
+        optimizer.merge_batch_norm()
     else:
         mapper = TFOpMapperNHWC(model)
         optimizer = TFOptimizer(mapper)
diff --git a/x2paddle/optimizer/tf_optimizer.py b/x2paddle/optimizer/tf_optimizer.py
index 223a9b8..610a433 100644
--- a/x2paddle/optimizer/tf_optimizer.py
+++ b/x2paddle/optimizer/tf_optimizer.py
@@ -351,3 +351,130 @@ class TFOptimizer(object):
                 if node.fluid_code.layers[-1].op == "transpose":
                     node.fluid_code.layers[-2].output = name
                     del node.fluid_code.layers[-1]
+
+    def merge_batch_norm(self):
+        for i, name in enumerate(self.graph.topo_sort):
+            node = self.graph.get_node(name)
+            if node is None:
+                continue
+            is_batch_norm = True
+            if node.layer_type == "Add":
+                in_nodes0 = [
+                    self.graph.get_node(in_name) for in_name in node.inputs
+                ]
+                if in_nodes0[0].layer_type != "Mul" or in_nodes0[
+                        1].layer_type != "Sub":
+                    is_batch_norm = False
+                    continue
+
+                in_nodes1 = [
+                    self.graph.get_node(in_name)
+                    for in_name in in_nodes0[0].inputs
+                ]
+                in_nodes2 = [
+                    self.graph.get_node(in_name)
+                    for in_name in in_nodes0[1].inputs
+                ]
+                if len(in_nodes1[0].out_shapes[0]) != 4:
+                    is_batch_norm = False
+                    continue
+                if in_nodes1[1].layer_type != "Mul":
+                    is_batch_norm = False
+                    continue
+
+                if in_nodes2[0].layer_type != "Const" or in_nodes2[
+                        1].layer_type != "Mul":
+                    is_batch_norm = False
+                    continue
+
+                in_nodes3 = [
+                    self.graph.get_node(in_name)
+                    for in_name in in_nodes1[1].inputs
+                ]
+                if in_nodes3[0].layer_type != "Rsqrt" or in_nodes3[
+                        1].layer_type != "Const":
+                    is_batch_norm = False
+                    continue
+
+                in_nodes4 = [
+                    self.graph.get_node(in_name)
+                    for in_name in in_nodes2[1].inputs
+                ]
+                if in_nodes4[0].layer_type != "Const" or in_nodes4[
+                        1].layer_name != in_nodes1[1].layer_name:
+                    is_batch_norm = False
+                    continue
+
+                in_nodes5 = self.graph.get_node(in_nodes3[0].inputs[0])
+                if in_nodes5.layer_type != "Add":
+                    is_batch_norm = False
+                    continue
+
+                in_nodes6 = [
+                    self.graph.get_node(in_name) for in_name in in_nodes5.inputs
+                ]
+                if in_nodes6[0].layer_type != "Const" or in_nodes6[
+                        1].layer_type != "Const":
+                    is_batch_norm = False
+                    continue
+
+                conv_shape = in_nodes1[0].out_shapes[0]
+                if conv_shape[3] < 0:
+                    is_batch_norm = False
+                    continue
+
+                # moving_variance
+                if in_nodes6[0].value.size != conv_shape[3]:
+                    is_batch_norm = False
+                    continue
+
+                # epsilon
+                if in_nodes6[1].value.size != 1:
+                    is_batch_norm = False
+                    continue
+
+                # gamma
+                if in_nodes3[1].value.size != conv_shape[3]:
+                    is_batch_norm = False
+                    continue
+
+                # moving_mean
+                if in_nodes4[0].value.size != conv_shape[3]:
+                    is_batch_norm = False
+                    continue
+
+                # beta
+                if in_nodes2[0].value.size != conv_shape[3]:
+                    is_batch_norm = False
+                    continue
+
+                if is_batch_norm:
+                    index = in_nodes1[0].outputs.index(in_nodes0[0].layer_name)
+                    del in_nodes1[0].outputs[index]
+                    node.layer_type = "FusedBatchNorm"
+                    node.inputs = [in_nodes1[0].layer_name]
+                    node.outputs = node.outputs
+                    act = node.fluid_code.layers[-1].param_attr.get("act", None)
+                    node.fluid_code.clear()
+                    attr = {
+                        "epsilon": in_nodes6[1].value,
+                        "param_attr": string(in_nodes3[1].layer_name),
+                        "bias_attr": string(in_nodes2[0].layer_name),
+                        "moving_mean_name": string(in_nodes4[0].layer_name),
+                        "moving_variance_name": string(in_nodes6[0].layer_name),
+                        "is_test": True,
+                        "act": act
+                    }
+
+                    node.fluid_code.add_layer("batch_norm",
+                                              inputs=cp.copy(in_nodes1[0]),
+                                              output=node,
+                                              param_attr=attr)
+
+                del self.graph.node_map[in_nodes0[0].layer_name]
+                del self.graph.node_map[in_nodes0[1].layer_name]
+                del self.graph.node_map[in_nodes1[1].layer_name]
+                del self.graph.node_map[in_nodes2[1].layer_name]
+                del self.graph.node_map[in_nodes3[0].layer_name]
+                del self.graph.node_map[in_nodes4[0].layer_name]
+                del self.graph.node_map[in_nodes5.layer_name]
-- 
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