Make cast op support bool (#6562)

Also add `elemwise_sub/mul/abs/clip` layers

paddle/operators/cast_op.cc

@@ -74,4 +74,5 @@ REGISTER_OP_WITH_KERNEL(cast, ops::CastOpGradMaker, ops::CastOpInferShape,
 REGISTER_OP_CPU_KERNEL(cast, ops::CastOpKernel<CPU, float>,
                        ops::CastOpKernel<CPU, double>,
                        ops::CastOpKernel<CPU, int>,
-                       ops::CastOpKernel<CPU, int64_t>);
+                       ops::CastOpKernel<CPU, int64_t>,
+                       ops::CastOpKernel<CPU, bool>);

paddle/operators/cast_op.cu

@@ -19,4 +19,5 @@ using CastOpKernel =
     paddle::operators::CastOpKernel<paddle::platform::CUDADeviceContext, T>;
 
 REGISTER_OP_CUDA_KERNEL(cast, CastOpKernel<float>, CastOpKernel<double>,
-                        CastOpKernel<int>, CastOpKernel<int64_t>);
+                        CastOpKernel<int>, CastOpKernel<int64_t>,
+                        CastOpKernel<bool>);

python/paddle/v2/fluid/layers.py

@@ -15,8 +15,9 @@ __all__ = [
 ]
 
 _REGISTER_LAYER_FROM_OPS = [
-    'mean', 'mul', 'elementwise_add', 'elementwise_div', 'dropout', 'reshape',
-    'sigmoid', 'scale', 'transpose', 'sigmoid_cross_entropy_with_logits'
+    'mean', 'mul', 'dropout', 'reshape', 'sigmoid', 'scale', 'transpose',
+    'sigmoid_cross_entropy_with_logits', 'elementwise_add', 'elementwise_div',
+    'elementwise_sub', 'elementwise_mul', 'clip', 'abs'
 ]
 
 for _OP in set(_REGISTER_LAYER_FROM_OPS):