From c42e3aecdfe41798f3f1d707fb93200cbabbd516 Mon Sep 17 00:00:00 2001
From: SunAhong1993 <sunyanfang01@baidu.com>
Date: Thu, 19 Nov 2020 19:58:59 +0800
Subject: [PATCH] add prelu

---
 x2paddle/optimizer/tensorflow/prelu.py | 123 +++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 x2paddle/optimizer/tensorflow/prelu.py

diff --git a/x2paddle/optimizer/tensorflow/prelu.py b/x2paddle/optimizer/tensorflow/prelu.py
new file mode 100644
index 0000000..cec49f4
--- /dev/null
+++ b/x2paddle/optimizer/tensorflow/prelu.py
@@ -0,0 +1,123 @@
+import copy
+import numpy as np
+from collections import OrderedDict
+from x2paddle.core.program import PaddleLayer
+from x2paddle.core.util import *
+
+
+class PReLUOpt:
+    def __init__(self):
+        pass
+
+    def run(self, graph):
+        print("Optimize: PReLUOpt...")
+        layers = copy.deepcopy(graph.layers)
+        for layer_id, layer in layers.items():
+            if layer.kernel != "fluid.layers.elementwise_add":
+                continue
+            axis = layer.attrs.get('axis', -1)
+            if axis != -1 and axis != 3:
+                continue
+
+            input_ids0 = graph.edges_in[layer_id]
+            relu_layer0 = graph.layers[input_ids0[0]]
+            mul_layer0 = graph.layers[input_ids0[1]]
+            
+            if relu_layer0.kernel != "fluid.layers.relu":
+                continue
+            if mul_layer0.kernel != "fluid.layers.elementwise_mul":
+                continue
+            
+            axis = mul_layer0.attrs.get('axis', -1)
+            if axis != -1 and axis != 3:
+                continue
+            if len(graph.edges_out.get(input_ids0[0], [])) != 1:
+                continue
+            if len(graph.edges_out.get(input_ids0[1], [])) != 1:
+                continue
+                
+            input_ids1_0 = graph.edges_in[input_ids0[0]]
+            input_ids1_1 = graph.edges_in[input_ids0[1]]
+            fill_layer = graph.layers[input_ids1_1[1]]
+            mul_layer1 = graph.layers[input_ids1_1[0]]
+            if fill_layer.kernel != "fluid.layers.fill_constant":
+                continue
+            if mul_layer1.kernel != "fluid.layers.elementwise_mul":
+                continue
+            axis = mul_layer1.attrs.get('axis', -1)
+            if axis != -1 and axis != 0:
+                continue
+            if len(graph.edges_out.get(input_ids1_1[1], [])) != 1:
+                continue
+            if len(graph.edges_out.get(input_ids1_0[0], [])) != 3:
+                continue     
+              
+            input_ids2 = graph.edges_in[input_ids1_1[0]]    
+            alpha = graph.layers[input_ids2[0]]
+            sub_layer = graph.layers[input_ids2[1]]
+            if alpha.kernel != "fluid.layers.create_parameter":
+                continue
+            if sub_layer.kernel != "fluid.layers.elementwise_sub":
+                continue
+            axis = sub_layer.attrs.get('axis', -1)
+            if axis != -1 and axis != 3:
+                continue
+            if len(graph.edges_out.get(input_ids2[0], [])) != 1:
+                continue
+            if len(graph.edges_out.get(input_ids2[1], [])) != 1:
+                continue
+            if alpha.outputs[0] not in graph.parameters:
+                continue
+            
+            input_ids3 = graph.edges_in[input_ids2[1]]
+            add_layer = graph.layers[input_ids3[0]]
+            abs_layer = graph.layers[input_ids3[1]]
+            if abs_layer.kernel != "fluid.layers.abs":
+                continue
+            if len(graph.edges_out.get(input_ids3[1], [])) != 1:
+                continue
+                
+
+            ids = set([
+                layer.id, relu_layer0.id, mul_layer0.id, fill_layer.id, mul_layer1.id, alpha.id,
+                sub_layer.id, abs_layer.id])
+
+            for id in ids:
+                del graph.layers[id]
+                if id in graph.edges_in:
+                    del graph.edges_in[id]
+                if id in graph.edges_out:
+                    del graph.edges_out[id]
+
+            copy_layers = copy.deepcopy(graph.layers)
+            graph.layers = OrderedDict()
+            for k, v in copy_layers.items():
+                if k != add_layer.id:
+                    graph.layers[k] = v
+                    continue
+                graph.layers[k] = v
+                transpose0 = PaddleLayer(
+                    id='{}_1'.format(k),
+                    kernel="fluid.layers.transpose",
+                    inputs={"x": v.outputs[0]},
+                    outputs=["transpose_for_prelu"],
+                    perm=[0, 3, 1, 2])
+                prelu = PaddleLayer(
+                    id='{}_2'.format(k),
+                    kernel="fluid.layers.prelu",
+                    inputs={"x": "transpose_for_prelu"},
+                    outputs=layer.outputs,
+                    mode=string("channel"),
+                    param_attr="'{}'".format(alpha.outputs[0]))
+                transpose1 = PaddleLayer(
+                    id=layer_id,
+                    kernel="fluid.layers.transpose",
+                    inputs={"x": layer.outputs[0]},
+                    outputs=layer.outputs,
+                    perm=[0, 2, 3, 1])
+                graph.layers[transpose0.id] = transpose0
+                graph.layers[prelu.id] = prelu
+                graph.layers[transpose1.id] = transpose1
+                graph.parameters[alpha.outputs[0]] = np.expand_dims(graph.parameters[alpha.outputs[0]], 0)
+        graph.build()
+        
-- 
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