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MXNET_REGISTER_API("_npi.zeros")
.set_body([](runtime::MXNetArgs args, runtime::MXNetRetValue* ret) {  // Part1: populate NodeAttrs
  // Part1: populate NodeAttrs
  using namespace runtime;
  const nnvm::Op* op = Op::Get("_npi_zeros");
  nnvm::NodeAttrs attrs;
  op::InitOpParam param;
  if (args[0].type_code() == kDLInt) {
    param.shape = TShape(1, args[0].operator int64_t());
  } else {
    param.shape = TShape(args[0].operator ObjectRef());
  }
  if (args[1].type_code() == kNull) {
    param.dtype = mshadow::kFloat32;
  } else {
    param.dtype = String2MXNetTypeWithBool(args[1].operator std::string());
  }
  attrs.parsed = std::move(param);
  attrs.op = op;
  SetAttrDict<op::InitOpParam>(&attrs);
  if (args[2].type_code() != kNull) {
    attrs.dict["ctx"] = args[2].operator std::string();
  }  
  // Part2: invoke
  int num_outputs = 0;
  auto ndoutputs = Invoke(op, &attrs, 0, nullptr, &num_outputs, nullptr);
  *ret = ndoutputs[0];
});