From d81e53cff2fb19516d405491eef57f23e8f36d48 Mon Sep 17 00:00:00 2001
From: Ke Han <kehan5800@gmail.com>
Date: Mon, 24 Feb 2020 13:49:35 +0800
Subject: [PATCH] * Fix rfmod function

---
 python/mxnet/ndarray/numpy/_op.py                     |  2 +-
 python/mxnet/symbol/numpy/_symbol.py                  |  2 +-
 src/operator/mshadow_op.h                             | 11 +++++++++++
 .../numpy/np_elemwise_broadcast_op_extended.cc        |  9 +++++++++
 .../numpy/np_elemwise_broadcast_op_extended.cu        |  6 ++++++
 src/operator/operator_tune.cc                         |  1 +
 6 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/python/mxnet/ndarray/numpy/_op.py b/python/mxnet/ndarray/numpy/_op.py
index 91dfba7c7281..119b22959522 100644
--- a/python/mxnet/ndarray/numpy/_op.py
+++ b/python/mxnet/ndarray/numpy/_op.py
@@ -1176,7 +1176,7 @@ def fmod(x1, x2, out=None, **kwargs):
     out : ndarray or scalar
         This is a scalar if both x1 and x2 are scalars.
     """
-    return _ufunc_helper(x1, x2, _npi.fmod, _np.fmod, _npi.fmod_scalar, out)
+    return _ufunc_helper(x1, x2, _npi.fmod, _np.fmod, _npi.fmod_scalar, _npi.rfmod_scalar, out)
 
 
 @set_module('mxnet.ndarray.numpy')
diff --git a/python/mxnet/symbol/numpy/_symbol.py b/python/mxnet/symbol/numpy/_symbol.py
index 71ced3844f90..c1e1104625ff 100644
--- a/python/mxnet/symbol/numpy/_symbol.py
+++ b/python/mxnet/symbol/numpy/_symbol.py
@@ -1580,7 +1580,7 @@ def mod(x1, x2, out=None, **kwargs):
 @set_module('mxnet.symbol.numpy')
 @wrap_np_binary_func
 def fmod(x1, x2, out=None, **kwargs):
-    return _ufunc_helper(x1, x2, _npi.fmod, _np.fmod, _npi.fmod_scalar, out)
+    return _ufunc_helper(x1, x2, _npi.fmod, _np.fmod, _npi.fmod_scalar, _npi.rfmod_scalar, out)
 
 
 @set_module('mxnet.symbol.numpy')
diff --git a/src/operator/mshadow_op.h b/src/operator/mshadow_op.h
index b50256eecf9d..4d9de29ce709 100644
--- a/src/operator/mshadow_op.h
+++ b/src/operator/mshadow_op.h
@@ -806,6 +806,17 @@ struct fmod : public mxnet_op::tunable {
   }
 };
 
+struct rfmod : public mxnet_op::tunable {
+  template<typename DType>
+  MSHADOW_XINLINE static DType Map(DType a, DType b) {
+    if (a == DType(0)) {
+      return DType(0);
+    } else  {
+      return DType(::fmod(static_cast<double>(b), static_cast<double>(a)));
+    }
+  }
+};
+
 template<>
 MSHADOW_XINLINE mshadow::half::half2_t mod::Map<mshadow::half::half2_t>
                                                (mshadow::half::half2_t a,
diff --git a/src/operator/numpy/np_elemwise_broadcast_op_extended.cc b/src/operator/numpy/np_elemwise_broadcast_op_extended.cc
index 308e254c2b4d..3d79e3a4105a 100644
--- a/src/operator/numpy/np_elemwise_broadcast_op_extended.cc
+++ b/src/operator/numpy/np_elemwise_broadcast_op_extended.cc
@@ -455,5 +455,14 @@ MXNET_OPERATOR_REGISTER_BINARY(_backward_npi_fmod_scalar)
 .set_attr_parser([](NodeAttrs *attrs) { attrs->parsed = std::stod(attrs->dict["scalar"]); })
 .set_attr<FCompute>("FCompute<cpu>", BinaryScalarOp::Backward<cpu, mshadow_op::mod_grad>);
 
+MXNET_OPERATOR_REGISTER_NP_BINARY_SCALAR(_npi_rfmod_scalar)
+.set_attr<FCompute>("FCompute<cpu>", BinaryScalarOp::Compute<cpu, mshadow_op::rfmod>)
+.set_attr<nnvm::FGradient>("FGradient", ElemwiseGradUseIn{"_backward_npi_rfmod_scalar"});
+
+MXNET_OPERATOR_REGISTER_BINARY(_backward_npi_rfmod_scalar)
+.add_argument("scalar", "float", "scalar value")
+.set_attr_parser([](NodeAttrs *attrs) { attrs->parsed = std::stod(attrs->dict["scalar"]); })
+.set_attr<FCompute>("FCompute<cpu>", BinaryScalarOp::Backward<cpu, mshadow_op::rmod_grad>);
+
 }  // namespace op
 }  // namespace mxnet
diff --git a/src/operator/numpy/np_elemwise_broadcast_op_extended.cu b/src/operator/numpy/np_elemwise_broadcast_op_extended.cu
index 3bb6b2d0aee6..8e3ec3db8784 100644
--- a/src/operator/numpy/np_elemwise_broadcast_op_extended.cu
+++ b/src/operator/numpy/np_elemwise_broadcast_op_extended.cu
@@ -155,5 +155,11 @@ NNVM_REGISTER_OP(_npi_fmod_scalar)
 NNVM_REGISTER_OP(_backward_npi_fmod_scalar)
 .set_attr<FCompute>("FCompute<gpu>", BinaryScalarOp::Backward<gpu, mshadow_op::mod_grad>);
 
+NNVM_REGISTER_OP(_npi_rfmod_scalar)
+.set_attr<FCompute>("FCompute<gpu>", BinaryScalarOp::Compute<gpu, mshadow_op::rfmod>);
+
+NNVM_REGISTER_OP(_backward_npi_rfmod_scalar)
+.set_attr<FCompute>("FCompute<gpu>", BinaryScalarOp::Backward<gpu, mshadow_op::rmod_grad>);
+
 }  // namespace op
 }  // namespace mxnet
diff --git a/src/operator/operator_tune.cc b/src/operator/operator_tune.cc
index 85a14765680f..b76e341b9fc6 100644
--- a/src/operator/operator_tune.cc
+++ b/src/operator/operator_tune.cc
@@ -346,6 +346,7 @@ IMPLEMENT_BINARY_WORKLOAD_BWD(mxnet::op::mshadow_op::div_rgrad);  // NOLINT()
 IMPLEMENT_BINARY_WORKLOAD_BWD(mxnet::op::mshadow_op::rdiv_grad);  // NOLINT()
 IMPLEMENT_BINARY_WORKLOAD_FWD(mxnet::op::mshadow_op::mod);  // NOLINT()
 IMPLEMENT_BINARY_WORKLOAD_FWD(mxnet::op::mshadow_op::fmod);  // NOLINT()
+IMPLEMENT_BINARY_WORKLOAD_FWD(mxnet::op::mshadow_op::rfmod);  // NOLINT()
 IMPLEMENT_BINARY_WORKLOAD_BWD(mxnet::op::mshadow_op::mod_grad);  // NOLINT()
 IMPLEMENT_BINARY_WORKLOAD_BWD(mxnet::op::mshadow_op::mod_rgrad);  // NOLINT()
 IMPLEMENT_BINARY_WORKLOAD_FWD(mxnet::op::mshadow_op::rmod);  // NOLINT()