Create vgg_variant.py

ppcls/arch/backbone/variant_models/vgg_variant.py

+import paddle
+from paddle.nn import Sigmoid
+from ppcls.arch.backbone.legendary_models.vgg import VGG19
+ 
+__all__ = ["VGG19Sigmoid"]
+ 
+ 
+class SigmoidSuffix(paddle.nn.Layer):
+    def __init__(self, origin_layer):
+        super(SigmoidSuffix, self).__init__()
+        self.origin_layer = origin_layer
+        self.sigmoid = Sigmoid()
+ 
+    def forward(self, *input, res_dict=None, **kwargs):
+        x = self.origin_layer(input)
+        x = self.sigmoid(x)
+        return x
+ 
+ 
+def VGG19Sigmoid(pretrained=False, use_ssld=False, **kwargs):
+    def replace_function(origin_layer):
+        new_layer = SigmoidSuffix(origin_layer)
+        return new_layer
+ 
+    match_re = "linear_2"
+    model = VGG19(pretrained=pretrained, use_ssld=use_ssld, **kwargs)
+    model.replace_sub(match_re, replace_function, True)
+    return model