“abc167338a99f1b644e1a5d4bb324a566d2fd87f”上不存在“develop/doc/howto/usage/cluster/fabric_en.html”
update initializer API, including: NormalInitializer, TruncatedNormalInitializer, UniformInitializer, XavierNormalInitializer, XavierUniformInitializer, NumpyArrayInitializer.