#include <migraphx/gpu/batch_norm_inference.hpp>
#include <migraphx/gpu/context.hpp>

namespace migraphx {
inline namespace MIGRAPHX_INLINE_NS {
namespace gpu {

shape miopen_batch_norm_inference::compute_shape(const std::vector<shape>& inputs) const
{
    check_shapes{inputs, *this}.has(6);
    check_shapes{inputs.data(), inputs.data() + 1, *this}.same_ndims().max_ndims(5);
    return op.compute_shape({inputs.at(0), inputs.at(1), inputs.at(2), inputs.at(3), inputs.at(4)});
}

inline shape reshape_to_2d(const shape& input)
{
    auto dims = input.lens();
    if(dims.size() >= 4)
        return input;

    std::vector<size_t> new_dims(dims.begin(), dims.end());
    std::size_t num = 4 - dims.size();
    new_dims.insert(new_dims.end(), num, 1);
    return {input.type(), new_dims};
}

argument miopen_batch_norm_inference::compute(context& ctx,
                                              const shape& output_shape,
                                              const std::vector<argument>& args) const
{
    shape x_shape  = args[0].get_shape();
    shape y_shape  = output_shape;
    shape bn_shape = args[3].get_shape();

    auto x_desc  = make_tensor(reshape_to_2d(x_shape));
    auto y_desc  = make_tensor(reshape_to_2d(y_shape));
    auto bn_desc = make_tensor(reshape_to_2d(bn_shape));

    float alpha = 1.0;
    float beta  = 0.0f;

    miopenBatchNormalizationForwardInference(ctx.get_stream().get_miopen(),
                                             miopenBatchNormMode_t(op.bn_mode),
                                             &alpha,
                                             &beta,
                                             x_desc.get(),
                                             args[0].implicit(),
                                             y_desc.get(),
                                             args[5].implicit(),
                                             bn_desc.get(),
                                             args[1].implicit(),
                                             args[2].implicit(),
                                             args[3].implicit(),
                                             args[4].implicit(),
                                             op.epsilon);

    return args[5];
}

} // namespace gpu
} // namespace MIGRAPHX_INLINE_NS
} // namespace migraphx
