logical and

src/operator/mshadow_op.h

@@ -317,6 +317,8 @@ MXNET_BINARY_MATH_OP_NC(eq, a == b ? DType(1) : DType(0));
 
 MXNET_BINARY_MATH_OP_NC(ne, a != b ? DType(1) : DType(0));
 
+MXNET_BINARY_MATH_OP(logical_and, a && b ? DType(1) : DType(0));
+
 MXNET_UNARY_MATH_OP(square_root, math::sqrt(a));
 
 MXNET_UNARY_MATH_OP(square_root_grad, 0.5f / math::id(a));

src/operator/operator_tune.cc

@@ -342,6 +342,8 @@ IMPLEMENT_BINARY_WORKLOAD_FWD(mxnet::op::mshadow_op::ne);  // NOLINT()
 IMPLEMENT_BINARY_WORKLOAD_BWD(mxnet::op::mshadow_op::ne);  // NOLINT()
 IMPLEMENT_BINARY_WORKLOAD_FWD(mxnet::op::mshadow_op::eq);  // NOLINT()
 IMPLEMENT_BINARY_WORKLOAD_BWD(mxnet::op::mshadow_op::eq);  // NOLINT()
+IMPLEMENT_BINARY_WORKLOAD_FWD(mxnet::op::mshadow_op::logical_and);  // NOLINT()
+IMPLEMENT_BINARY_WORKLOAD_BWD(mxnet::op::mshadow_op::logical_and);  // NOLINT()
 IMPLEMENT_BINARY_WORKLOAD_FWD(mxnet::op::mshadow_op::smooth_l1_loss);  // NOLINT()
 IMPLEMENT_BINARY_WORKLOAD_BWD(mxnet::op::mshadow_op::smooth_l1_gradient);  // NOLINT()
 IMPLEMENT_BLANK_WORKLOAD_FWD(mxnet::op::mxnet_op::set_to_int<0>);  // NOLINT()

src/operator/tensor/elemwise_binary_broadcast_op_logic.cc

@@ -137,5 +137,23 @@ Example::
 .set_attr<FCompute>("FCompute<cpu>", BinaryBroadcastCompute<cpu, mshadow_op::le>)
 .set_attr<nnvm::FGradient>("FGradient", MakeZeroGradNodes);
 
+MXNET_OPERATOR_REGISTER_BINARY_BROADCAST(broadcast_logical_and)
+.describe(R"code(Returns the result of element-wise **logical and** with broadcasting.
+
+Example::
+
+   x = [[ 1.,  1.,  1.],
+        [ 1.,  1.,  1.]]
+
+   y = [[ 0.],
+        [ 1.]]
+
+   broadcast_logical_and(x, y) = [[ 0.,  0.,  0.],
+                                   [ 1.,  1.,  1.]]
+
+)code" ADD_FILELINE)
+.set_attr<FCompute>("FCompute<cpu>", BinaryBroadcastCompute<cpu, mshadow_op::logical_and>)
+.set_attr<nnvm::FGradient>("FGradient", MakeZeroGradNodes);
+
 }  // namespace op
 }  // namespace mxnet

src/operator/tensor/elemwise_binary_broadcast_op_logic.cu

@@ -47,5 +47,9 @@ NNVM_REGISTER_OP(broadcast_lesser)
 NNVM_REGISTER_OP(broadcast_lesser_equal)
 .set_attr<FCompute>("FCompute<gpu>", BinaryBroadcastCompute<gpu, mshadow_op::le>);
 
+// logical and
+NNVM_REGISTER_OP(broadcast_logical_and)
+.set_attr<FCompute>("FCompute<gpu>", BinaryBroadcastCompute<gpu, mshadow_op::logical_and>);
+
 }  // namespace op
 }  // namespace mxnet

tests/python/unittest/test_operator.py

@@ -1581,6 +1581,13 @@ def test_bmin(a, b):
         data = gen_broadcast_data(idx=200)
         check_bmaxmin_gradient(c, data[0], data[1], 0.001, 1e-2, 1e-3)
 
+    def test_band(a, b):
+        c = mx.sym.broadcast_logical_and(a, b)
+        check_binary_op_forward(c, lambda x, y: np.logical_and(x, y), gen_broadcast_data, mx_nd_func=mx.nd.broadcast_logical_and)
+        # pass idx=200 to gen_broadcast_data so that generated ndarrays' sizes are not too big
+        data = gen_broadcast_data(idx=200)
+        check_bmaxmin_gradient(c, data[0], data[1], 0.001, 1e-2, 1e-3)
+
     test_bplus(a, b)
     test_bminus(a, b)
     test_bmul(a, b)
@@ -1591,7 +1598,7 @@ def test_bmin(a, b):
     test_bequal(a, b)
     test_bmax(a, b)
     test_bmin(a, b)
-
+    test_band(a, b)
 
 @with_seed()
 def test_run_convolution_dilated_impulse_response(dil=(1,1), kernel_shape=(3,3), verbose=False):