merge develop branch changes.

src/auto_contiguous.cpp

 #include <migraphx/auto_contiguous.hpp>
 #include <migraphx/program.hpp>
 #include <migraphx/instruction.hpp>
-#include <migraphx/operators.hpp>
+#include <migraphx/op/contiguous.hpp>
 #include <migraphx/iterator_for.hpp>
 
 namespace migraphx {

src/dead_code_elimination.cpp

@@ -4,6 +4,7 @@
 #include <migraphx/iterator_for.hpp>
 #include <migraphx/functional.hpp>
 #include <migraphx/ranges.hpp>
+#include <unordered_set>
 
 namespace migraphx {
 inline namespace MIGRAPHX_INLINE_NS {
@@ -50,7 +51,8 @@ void dead_code_elimination::apply(program& p) const
             assert(p.has_instruction(leaf));
             if(leaf->outputs().empty())
             {
-                auto args = leaf->inputs();
+                std::unordered_set<instruction_ref> args(leaf->inputs().begin(),
+                                                         leaf->inputs().end());
                 leaf->clear_arguments();
                 assert(bidistance(p, last, leaf) < 0);
                 assert(leaf != ins);

src/eliminate_allocation.cpp

 #include <migraphx/eliminate_allocation.hpp>
 #include <migraphx/program.hpp>
 #include <migraphx/instruction.hpp>
-#include <migraphx/operators.hpp>
+#include <migraphx/op/load.hpp>
 #include <migraphx/iterator_for.hpp>
 #include <migraphx/ranges.hpp>
 #include <migraphx/stringutils.hpp>

src/eliminate_concat.cpp

@@ -2,7 +2,8 @@
 #include <migraphx/eliminate_concat.hpp>
 #include <migraphx/program.hpp>
 #include <migraphx/instruction.hpp>
-#include <migraphx/operators.hpp>
+#include <migraphx/op/load.hpp>
+#include <migraphx/op/identity.hpp>
 #include <migraphx/iterator_for.hpp>
 #include <migraphx/dfor.hpp>
 

src/eliminate_contiguous.cpp

 #include <migraphx/eliminate_contiguous.hpp>
 #include <migraphx/program.hpp>
 #include <migraphx/instruction.hpp>
-#include <migraphx/operators.hpp>
 #include <migraphx/iterator_for.hpp>
 #include <migraphx/ranges.hpp>
 #include <migraphx/stringutils.hpp>

src/eliminate_identity.cpp

 #include <migraphx/eliminate_identity.hpp>
 #include <migraphx/program.hpp>
 #include <migraphx/instruction.hpp>
-#include <migraphx/operators.hpp>
 #include <migraphx/iterator_for.hpp>
 #include <migraphx/stringutils.hpp>
 #include <utility>

src/eliminate_pad.cpp

 #include <migraphx/eliminate_pad.hpp>
 #include <migraphx/program.hpp>
 #include <migraphx/instruction.hpp>
-#include <migraphx/operators.hpp>
+#include <migraphx/op/convolution.hpp>
+#include <migraphx/op/im2col.hpp>
+#include <migraphx/op/pooling.hpp>
+#include <migraphx/op/pad.hpp>
 #include <migraphx/iterator_for.hpp>
 #include <migraphx/stringutils.hpp>
 

src/fwd_conv_batchnorm_rewrite.cpp

 #include <migraphx/fwd_conv_batchnorm_rewrite.hpp>
 #include <migraphx/program.hpp>
 #include <migraphx/instruction.hpp>
-#include <migraphx/operators.hpp>
+#include <migraphx/op/batch_norm.hpp>
+#include <migraphx/op/broadcast.hpp>
+#include <migraphx/op/add.hpp>
 #include <migraphx/iterator_for.hpp>
 #include <migraphx/ranges.hpp>
 #include <migraphx/dfor.hpp>

src/include/migraphx/concat_opt.hpp

@@ -9,7 +9,7 @@
 #include <utility>
 
 #include <migraphx/operation.hpp>
-#include <migraphx/operators.hpp>
+#include <migraphx/op/concat.hpp>
 #include <migraphx/config.hpp>
 
 namespace migraphx {

src/include/migraphx/op/abnormal_ops.hpp

+#ifndef MIGRAPHX_GUARD_OPERATORS_ABNORMAL_OPS_HPP
+#define MIGRAPHX_GUARD_OPERATORS_ABNORMAL_OPS_HPP
+
+#include <array>
+#include <migraphx/operation.hpp>
+#include <migraphx/check_shapes.hpp>
+#include <migraphx/stringutils.hpp>
+#include <migraphx/streamutils.hpp>
+#include <migraphx/literal.hpp>
+#include <migraphx/shape_for_each.hpp>
+#include <migraphx/config.hpp>
+#include <cmath>
+#include <utility>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+namespace op {
+
+struct not_computable
+{
+    argument compute(const shape&, const std::vector<argument>&) const
+    {
+        MIGRAPHX_THROW("not computable");
+    }
+};
+
+struct undefined
+{
+    std::string name() const { return "undefined"; }
+    shape compute_shape(const std::vector<shape>& inputs) const
+    {
+        check_shapes{inputs, *this}.has(0);
+        return {};
+    }
+
+    argument compute(const shape&, const std::vector<argument>&) const { return {{}, nullptr}; }
+};
+
+struct unknown
+{
+    std::string op;
+    std::string name() const { return "unknown:" + op; }
+    shape compute_shape(std::vector<shape> input) const
+    {
+        if(input.empty())
+            return {};
+        else
+            return input.front();
+    }
+
+    friend std::ostream& operator<<(std::ostream& os, const unknown& x)
+    {
+        os << x.name();
+        return os;
+    }
+};
+
+} // namespace op
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif

src/include/migraphx/op/abs.hpp

+#ifndef MIGRAPHX_GUARD_OPERATORS_ABS_HPP
+#define MIGRAPHX_GUARD_OPERATORS_ABS_HPP
+
+#include <array>
+#include <migraphx/op/unary.hpp>
+#include <migraphx/operation.hpp>
+#include <migraphx/check_shapes.hpp>
+#include <migraphx/stringutils.hpp>
+#include <migraphx/streamutils.hpp>
+#include <migraphx/literal.hpp>
+#include <migraphx/shape_for_each.hpp>
+#include <migraphx/config.hpp>
+#include <cmath>
+#include <utility>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+namespace op {
+
+struct abs : unary
+{
+    std::string name() const { return "abs"; }
+};
+
+} // namespace op
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif

src/include/migraphx/op/acos.hpp

+#ifndef MIGRAPHX_GUARD_OPERATORS_ACOS_HPP
+#define MIGRAPHX_GUARD_OPERATORS_ACOS_HPP
+
+#include <array>
+#include <migraphx/op/unary.hpp>
+#include <migraphx/operation.hpp>
+#include <migraphx/check_shapes.hpp>
+#include <migraphx/stringutils.hpp>
+#include <migraphx/streamutils.hpp>
+#include <migraphx/literal.hpp>
+#include <migraphx/shape_for_each.hpp>
+#include <migraphx/config.hpp>
+#include <cmath>
+#include <utility>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+namespace op {
+
+struct acos : unary
+{
+    std::string name() const { return "acos"; }
+};
+
+} // namespace op
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif

src/include/migraphx/op/add.hpp

+#ifndef MIGRAPHX_GUARD_OPERATORS_ADD_HPP
+#define MIGRAPHX_GUARD_OPERATORS_ADD_HPP
+
+#include <array>
+#include <migraphx/op/binary.hpp>
+#include <migraphx/operation.hpp>
+#include <migraphx/check_shapes.hpp>
+#include <migraphx/stringutils.hpp>
+#include <migraphx/streamutils.hpp>
+#include <migraphx/literal.hpp>
+#include <migraphx/shape_for_each.hpp>
+#include <migraphx/config.hpp>
+#include <cmath>
+#include <utility>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+namespace op {
+
+struct add : binary
+{
+    std::string name() const { return "add"; }
+};
+
+} // namespace op
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif

src/include/migraphx/op/as_shape.hpp

+#ifndef MIGRAPHX_GUARD_OPERATORS_AS_SHAPE_HPP
+#define MIGRAPHX_GUARD_OPERATORS_AS_SHAPE_HPP
+
+#include <array>
+#include <migraphx/operation.hpp>
+#include <migraphx/check_shapes.hpp>
+#include <migraphx/stringutils.hpp>
+#include <migraphx/streamutils.hpp>
+#include <migraphx/literal.hpp>
+#include <migraphx/shape_for_each.hpp>
+#include <migraphx/config.hpp>
+#include <cmath>
+#include <utility>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+namespace op {
+
+struct as_shape
+{
+    shape s;
+    template <class Self, class F>
+    static auto reflect(Self& self, F f)
+    {
+        return pack(f(self.s, "shape"));
+    }
+
+    std::string name() const { return "as_shape"; }
+    shape compute_shape(const std::vector<shape>& inputs) const
+    {
+        check_shapes{inputs, *this}.has(1).standard();
+        assert(inputs.front().elements() == s.elements());
+        return s;
+    }
+    argument compute(shape output_shape, std::vector<argument> args) const
+    {
+        return {std::move(output_shape), std::move(args.front().data)};
+    }
+    int output_alias(const std::vector<shape>&) const { return 0; }
+};
+
+} // namespace op
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif

src/include/migraphx/op/asin.hpp

+#ifndef MIGRAPHX_GUARD_OPERATORS_ASIN_HPP
+#define MIGRAPHX_GUARD_OPERATORS_ASIN_HPP
+
+#include <array>
+#include <migraphx/op/unary.hpp>
+#include <migraphx/operation.hpp>
+#include <migraphx/check_shapes.hpp>
+#include <migraphx/stringutils.hpp>
+#include <migraphx/streamutils.hpp>
+#include <migraphx/literal.hpp>
+#include <migraphx/shape_for_each.hpp>
+#include <migraphx/config.hpp>
+#include <cmath>
+#include <utility>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+namespace op {
+
+struct asin : unary
+{
+    std::string name() const { return "asin"; }
+};
+
+} // namespace op
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif

src/include/migraphx/op/atan.hpp

+#ifndef MIGRAPHX_GUARD_OPERATORS_ATAN_HPP
+#define MIGRAPHX_GUARD_OPERATORS_ATAN_HPP
+
+#include <array>
+#include <migraphx/op/unary.hpp>
+#include <migraphx/operation.hpp>
+#include <migraphx/check_shapes.hpp>
+#include <migraphx/stringutils.hpp>
+#include <migraphx/streamutils.hpp>
+#include <migraphx/literal.hpp>
+#include <migraphx/shape_for_each.hpp>
+#include <migraphx/config.hpp>
+#include <cmath>
+#include <utility>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+namespace op {
+
+struct atan : unary
+{
+    std::string name() const { return "atan"; }
+};
+
+} // namespace op
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif

src/include/migraphx/op/batch_norm.hpp

+#ifndef MIGRAPHX_GUARD_OPERATORS_BATCH_NORM_HPP
+#define MIGRAPHX_GUARD_OPERATORS_BATCH_NORM_HPP
+
+#include <array>
+#include <migraphx/op/common.hpp>
+#include <migraphx/operation.hpp>
+#include <migraphx/check_shapes.hpp>
+#include <migraphx/stringutils.hpp>
+#include <migraphx/streamutils.hpp>
+#include <migraphx/literal.hpp>
+#include <migraphx/shape_for_each.hpp>
+#include <migraphx/config.hpp>
+#include <cmath>
+#include <utility>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+namespace op {
+
+struct batch_norm_inference
+{
+    float epsilon  = 1.0e-6f;
+    float momentum = 0.9f;
+
+    std::string name() const { return "batch_norm_inference"; }
+
+    enum bn_infer_mode_t
+    {
+        per_activation,
+        spatial,
+    };
+
+    bn_infer_mode_t bn_mode = spatial;
+
+    template <class Self, class F>
+    static auto reflect(Self& self, F f)
+    {
+        return pack(
+            f(self.epsilon, "epsilon"), f(self.momentum, "momentum"), f(self.bn_mode, "bn_mode"));
+    }
+
+    shape compute_shape(std::vector<shape> inputs) const
+    {
+        check_shapes{inputs, *this}.has(5);
+        check_shapes{inputs.data(), inputs.data() + 1, *this}.only_dims(4);
+        check_shapes{inputs.data() + 1, inputs.data() + inputs.size(), *this}.same_shape().elements(
+            inputs.front().lens()[1]);
+        return inputs.front();
+    }
+};
+
+} // namespace op
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif

src/include/migraphx/op/binary.hpp

+#ifndef MIGRAPHX_GUARD_OPERATORS_BINARY_HPP
+#define MIGRAPHX_GUARD_OPERATORS_BINARY_HPP
+
+#include <array>
+#include <migraphx/operation.hpp>
+#include <migraphx/check_shapes.hpp>
+#include <migraphx/stringutils.hpp>
+#include <migraphx/streamutils.hpp>
+#include <migraphx/literal.hpp>
+#include <migraphx/shape_for_each.hpp>
+#include <migraphx/config.hpp>
+#include <cmath>
+#include <utility>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+namespace op {
+
+struct binary
+{
+    shape compute_shape(std::vector<shape> inputs) const
+    {
+        check_shapes{inputs}.has(2).same_type().same_dims();
+        auto t    = inputs.at(0).type();
+        auto lens = inputs.at(0).lens();
+        return {t, lens};
+    }
+};
+
+} // namespace op
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif

src/include/migraphx/op/broadcast.hpp

+#ifndef MIGRAPHX_GUARD_OPERATORS_BROADCAST_HPP
+#define MIGRAPHX_GUARD_OPERATORS_BROADCAST_HPP
+
+#include <array>
+#include <migraphx/operation.hpp>
+#include <migraphx/check_shapes.hpp>
+#include <migraphx/stringutils.hpp>
+#include <migraphx/streamutils.hpp>
+#include <migraphx/literal.hpp>
+#include <migraphx/shape_for_each.hpp>
+#include <migraphx/config.hpp>
+#include <cmath>
+#include <utility>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+namespace op {
+
+/// The broadcast operator performs the numpy-style broadcasting of an axis of a given tensor. This
+/// is achieved primarily by setting the stride of the broadcasted axis to zero. Linear indicies are
+/// computed from multi-indicies by computing the inner product on the multi-index with the strides.
+/// For example, if we have a tensor A(2,3) it has lengths of (2,3) and strides of (3,1). If we want
+/// to compute the linear offset that corresponds to the element on the 2nd row (i = 1) and 3rd
+/// column (j = 2), we compute the following inner product (1,2) dot (3, 1) = 1*3 + 2*1 = 5. It is
+/// obvious from there that we can negate the effects of a given axis by setting the stride of that
+/// axis to zero.
+struct broadcast
+{
+    uint64_t axis = 0;
+
+    template <class Self, class F>
+    static auto reflect(Self& self, F f)
+    {
+        return pack(f(self.axis, "axis"));
+    }
+
+    shape broadcast_shape;
+    std::string name() const { return "broadcast"; }
+    shape compute_shape(std::vector<shape> inputs) const
+    {
+        auto t     = inputs.at(0).type();
+        auto input = inputs.at(0);
+
+        std::vector<size_t> bcast_strides(broadcast_shape.lens().size(), 0);
+
+        if(std::all_of(broadcast_shape.lens().cbegin(), broadcast_shape.lens().cend(), [&](auto x) {
+               return x == 1;
+           }))
+        {
+            if(axis != 0)
+                MIGRAPHX_THROW("when broadcasting tensor of size 1, axis should be 0");
+            return {t, broadcast_shape.lens(), std::move(bcast_strides)};
+        }
+        else
+        {
+            assert(broadcast_shape.lens().size() - axis >= input.lens().size());
+            if(!std::equal(
+                   input.lens().begin(), input.lens().end(), broadcast_shape.lens().begin() + axis))
+                MIGRAPHX_THROW("when broadcasting success sizes must match");
+            std::copy(input.strides().begin(), input.strides().end(), bcast_strides.begin() + axis);
+            return {t, broadcast_shape.lens(), std::move(bcast_strides)};
+        }
+    }
+    argument compute(shape output_shape, std::vector<argument> args) const
+    {
+        return {std::move(output_shape), std::move(args.at(0).data)};
+    }
+    int output_alias(const std::vector<shape>&) const { return 0; }
+};
+
+} // namespace op
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif

src/include/migraphx/op/common.hpp

+#ifndef MIGRAPHX_GUARD_OPERATORS_COMMON_HPP
+#define MIGRAPHX_GUARD_OPERATORS_COMMON_HPP
+
+#include <array>
+#include <migraphx/operation.hpp>
+#include <migraphx/check_shapes.hpp>
+#include <migraphx/stringutils.hpp>
+#include <migraphx/streamutils.hpp>
+#include <migraphx/literal.hpp>
+#include <migraphx/shape_for_each.hpp>
+#include <migraphx/config.hpp>
+#include <cmath>
+#include <utility>
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+namespace op {
+
+enum padding_mode_t
+{
+    default_, // NOLINT
+    same,
+    valid
+};
+
+// indicate rnn computation direction
+enum class rnn_direction
+{
+    forward,
+    reverse,
+    bidirectional,
+};
+
+} // namespace op
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+
+#endif