reorganize files to prepare for MIOpen integration (#51)

* change olc cmake

* adding online compile to fwd-v4r5r2

* update scripts

* remane fwd-v4r5r2 to fwd-v6r1

* clean up

host/host_tensor/src/host_tensor.cpp

@@ -0,0 +1,48 @@
+#include <boost/range/adaptor/transformed.hpp>
+#include <cassert>
+
+#include "host_tensor.hpp"
+
+void HostTensorDescriptor::CalculateStrides()
+{
+    mStrides.clear();
+    mStrides.resize(mLens.size(), 0);
+    if(mStrides.empty())
+        return;
+
+    mStrides.back() = 1;
+    std::partial_sum(
+        mLens.rbegin(), mLens.rend() - 1, mStrides.rbegin() + 1, std::multiplies<std::size_t>());
+}
+
+std::size_t HostTensorDescriptor::GetNumOfDimension() const { return mLens.size(); }
+
+std::size_t HostTensorDescriptor::GetElementSize() const
+{
+    assert(mLens.size() == mStrides.size());
+    return std::accumulate(
+        mLens.begin(), mLens.end(), std::size_t{1}, std::multiplies<std::size_t>());
+}
+
+std::size_t HostTensorDescriptor::GetElementSpace() const
+{
+    auto ls = mLens | boost::adaptors::transformed([](std::size_t v) { return v - 1; });
+    return std::inner_product(ls.begin(), ls.end(), mStrides.begin(), std::size_t{0}) + 1;
+}
+
+const std::vector<std::size_t>& HostTensorDescriptor::GetLengths() const { return mLens; }
+
+const std::vector<std::size_t>& HostTensorDescriptor::GetStrides() const { return mStrides; }
+
+void ostream_HostTensorDescriptor(const HostTensorDescriptor& desc, std::ostream& os)
+{
+    os << "dim " << desc.GetNumOfDimension() << ", ";
+
+    os << "lengths {";
+    LogRange(os, desc.GetLengths(), ", ");
+    os << "}, ";
+
+    os << "strides {";
+    LogRange(os, desc.GetStrides(), ", ");
+    os << "}" << std::endl;
+}