conv_2d_full_expr.hpp

//=======================================================================
// Copyright (c) 2014-2023 Baptiste Wicht
// Distributed under the terms of the MIT License.
// (See accompanying file LICENSE or copy at
//  http://opensource.org/licenses/MIT)
//=======================================================================

#pragma once

#include "etl/expr/base_temporary_expr.hpp"

//Get the implementations
#include "etl/impl/conv.hpp"

namespace etl {

template <etl_2d A, etl_2d B, bool Flipped>
struct conv_2d_full_expr : base_temporary_expr_bin<conv_2d_full_expr<A, B, Flipped>, A, B> {
    using value_type  = value_t<A>;                               
    using this_type   = conv_2d_full_expr<A, B, Flipped>;         
    using base_type   = base_temporary_expr_bin<this_type, A, B>; 
    using left_traits = decay_traits<A>;                          

    static constexpr auto storage_order = left_traits::storage_order; 

    static constexpr bool gpu_computable = cudnn_enabled && impl::cudnn::conv_possible_<A, B> && is_2d<A>;

    explicit conv_2d_full_expr(A a, B b) : base_type(a, b) {
        //Nothing else to init
    }

    // Assignment functions

    template <etl_2d I, etl_2d K, etl_2d C>
    static void check([[maybe_unused]] const I& input, [[maybe_unused]] const K& kernel, [[maybe_unused]] const C& conv) {
        if constexpr (all_fast<A, B, C>) {
            static_assert(etl::dim<0, C>() == etl::dim<0, I>() + etl::dim<0, K>() - 1, "Invalid dimensions for conv2_full");
            static_assert(etl::dim<1, C>() == etl::dim<1, I>() + etl::dim<1, K>() - 1, "Invalid dimensions for conv2_full");
        } else {
            cpp_assert(etl::dim(conv, 0) == etl::dim(input, 0) + etl::dim(kernel, 0) - 1, "Invalid dimensions for conv2_full");
            cpp_assert(etl::dim(conv, 1) == etl::dim(input, 1) + etl::dim(kernel, 1) - 1, "Invalid dimensions for conv2_full");
        }
    }

    template <etl_2d C>
    void assign_to(C&& c) const {
        inc_counter("temp:assign");

        auto& a = this->a();
        auto& b = this->b();

        check(a, b, c);

        if constexpr (Flipped) {
            detail::conv2_full_flipped_impl::apply(a, b, c);
        } else {
            detail::conv2_full_impl::apply(a, b, c);
        }
    }

    template <etl_2d L>
    void assign_add_to(L&& lhs) const {
        std_add_evaluate(*this, lhs);
    }

    template <etl_2d L>
    void assign_sub_to(L&& lhs) const {
        std_sub_evaluate(*this, lhs);
    }

    template <etl_2d L>
    void assign_mul_to(L&& lhs) const {
        std_mul_evaluate(*this, lhs);
    }

    template <etl_2d L>
    void assign_div_to(L&& lhs) const {
        std_div_evaluate(*this, lhs);
    }

    template <etl_2d L>
    void assign_mod_to(L&& lhs) const {
        std_mod_evaluate(*this, lhs);
    }

    friend std::ostream& operator<<(std::ostream& os, const conv_2d_full_expr& expr) {
        return os << "conv2_full(" << expr._a << ", " << expr._b << ")";
    }
};

template <etl_2d A, etl_2d B, bool Flipped>
struct etl_traits<etl::conv_2d_full_expr<A, B, Flipped>> {
    using expr_t       = etl::conv_2d_full_expr<A, B, Flipped>; 
    using left_expr_t  = std::decay_t<A>;                       
    using right_expr_t = std::decay_t<B>;                       
    using left_traits  = etl_traits<left_expr_t>;               
    using right_traits = etl_traits<right_expr_t>;              
    using value_type   = value_t<A>;                            

    static constexpr bool is_etl         = true;                                 
    static constexpr bool is_transformer = false;                                
    static constexpr bool is_view        = false;                                
    static constexpr bool is_magic_view  = false;                                
    static constexpr bool is_fast        = all_fast<A, B>;                       
    static constexpr bool is_linear      = false;                                
    static constexpr bool is_thread_safe = true;                                 
    static constexpr bool is_value       = false;                                
    static constexpr bool is_direct      = true;                                 
    static constexpr bool is_generator   = false;                                
    static constexpr bool is_padded      = false;                                
    static constexpr bool is_aligned     = true;                                 
    static constexpr bool is_temporary   = true;                                 
    static constexpr order storage_order = left_traits::storage_order;           
    static constexpr bool gpu_computable = is_gpu_t<value_type> && cuda_enabled; 

    template <vector_mode_t V>
    static constexpr bool vectorizable = true;

    template <size_t DD>
    static constexpr size_t dim() {
        return etl::dim<DD, A>() + etl::dim<DD, B>() - 1;
    }

    static size_t dim(const expr_t& e, size_t d) {
        return etl::dim(e._a, d) + etl::dim(e._b, d) - 1;
    }

    static size_t size(const expr_t& e) {
        return (etl::dim(e._a, 0) + etl::dim(e._b, 0) - 1) * (etl::dim(e._a, 1) + etl::dim(e._b, 1) - 1);
    }

    static constexpr size_t size() {
        return (etl::dim<0, A>() + etl::dim<0, B>() - 1) * (etl::dim<1, A>() + etl::dim<1, B>() - 1);
    }

    static constexpr size_t dimensions() {
        return 2;
    }

    static constexpr int complexity() noexcept {
        return -1;
    }
};

template <etl_2d A, etl_2d B>
conv_2d_full_expr<detail::build_type<A>, detail::build_type<B>, false> conv_2d_full(A&& a, B&& b) {
    return conv_2d_full_expr<detail::build_type<A>, detail::build_type<B>, false>{a, b};
}

template <etl_2d A, etl_2d B, etl_2d C>
auto conv_2d_full(A&& a, B&& b, C&& c) {
    c = conv_2d_full(a, b);

    return c;
}

template <etl_2d A, etl_2d B>
conv_2d_full_expr<detail::build_type<A>, detail::build_type<B>, true> conv_2d_full_flipped(A&& a, B&& b) {
    return conv_2d_full_expr<detail::build_type<A>, detail::build_type<B>, true>{a, b};
}

template <etl_2d A, etl_2d B, etl_2d C>
auto conv_2d_full_flipped(A&& a, B&& b, C&& c) {
    c = conv_2d_full_flipped(a, b);

    return c;
}

} //end of namespace etl