add arrayfire interop

Author: marty1885

Etaler/Interop/Arrayfire.hpp

@@ -0,0 +1,94 @@
+#pragma once
+
+#include <arrayfire.h>
+
+#include <Etaler/Core/Tensor.hpp>
+
+namespace et
+{
+
+Tensor from_afarray(const af::array& arr, bool transpose=true)
+{
+	et_assert(arr.type() == f32 || arr.type() == s32 || arr.type() == b8);
+
+        auto a = arr;
+        if(transpose) //ArrayFire stores data in fortran order, we might want to transpose it to make it C order
+                a = af::transpose(arr);
+
+        //Convert to et::Shape
+        Shape s;
+        auto dims = a.dims();
+        for(dim_t i=0;i<dims.ndims();i++)
+                s.push_back(dims[i]);
+
+        DType dtype = [](auto type) {
+                if(type == f32)
+                        return DType::Float;
+                else if(type == s32)
+                        return DType::Int32;
+                else
+                        return DType::Bool;
+        }(arr.type());
+
+        //Copy data from AF to Etaler
+        Tensor res;
+        if(dtype == DType::Float) {
+                auto ptr = a.host<float>();
+                res = Tensor(s, ptr);
+                af::freeHost(ptr);
+        }
+        else if(dtype == DType::Int32) {
+                auto ptr = a.host<int>();
+                res = Tensor(s, ptr);
+                af::freeHost(ptr);
+        }
+        else {
+                auto ptr = a.host<uint8_t>(); //Some arrayfire quarks
+                res = Tensor(s, ptr);
+                af::freeHost(ptr);
+        }
+
+        return res;
+}
+
+af::array to_afarray(const Tensor& t, bool transpose=true)
+{
+	et_assert(t.dimentions() <= 4);
+        af::dim4 dims;
+        //Initalize the dims (not Initalized by default)
+        for(int i=0;i<4;i++)
+                dims[i] = 1;
+        for(size_t i=0;i<t.dimentions();i++)
+                dims[4-t.dimentions()+i] = t.shape()[i];
+
+        af::dtype dtype = [](DType dtype) {
+                if(dtype == DType::Float)
+                        return f32;
+                else if(dtype == DType::Int32)
+                        return s32;
+                else
+                        return b8;
+        }(t.dtype());
+        af::array res(dims, dtype);
+
+        if(dtype == f32) {
+                auto v = t.toHost<float>();
+                res.write(v.data(), v.size()*dtypeToSize(t.dtype()));
+        }
+        else if(dtype == s32) {
+                auto v = t.toHost<int32_t>();
+                res.write(v.data(), v.size()*dtypeToSize(t.dtype()));
+        }
+        else {
+                auto v = t.toHost<uint8_t>();
+                res.write(v.data(), v.size()*dtypeToSize(t.dtype()));
+        }
+
+        if(transpose)
+                return res.T();
+        return res;
+
+
+}
+
+}