support mxStruct as table
-- in case of 1 elements
{
 [key1] = val1(Tensor)
 [key2] = val2(Tensor)
}

-- in case of N elements
{
 [key1] = {[0] = val1-1, [1] = val1-2, ....., [N-1] = val1-N , ["Length"] = N}
}