Fix comments mentioning MKL

Author: graemenail

src/graph/auto_tuner.h

@@ -26,7 +26,7 @@ class AutoTuner : public AutoTunerRecorder {
   const size_t collectStatMax = 50;
   UPtr<timer::CPUTimer> timer_;
 
-  // This structure holds a hash key an algorithm function (e.g. int16, packed gemm, mkl gemm)
+  // This structure holds a hash key an algorithm function (e.g. int16, packed gemm, fp32 gemm)
   // for a specific operation size
   // hash: a unique hash key for each operation size
   //      (e.g. m, n, k, transpose A, transpose B, bias size for GEMM)

src/graph/expression_operators.cpp

@@ -576,7 +576,7 @@ Expr bdot_legacy(Expr a, Expr b, bool transA, bool transB, float scale) {
 }
 
 Expr affineDefault(Expr a, Expr b, Expr bias, bool transA, bool transB, float scale) {
-  // general version, MKL, CBlas or CUDA
+  // general version (see affine for packed-type variants)
 
   int rows = a->shape().elements() / a->shape()[-1];
   Expr ones = a->graph()->ones({ rows, 1 });

src/tensors/backend.h

@@ -8,7 +8,7 @@ namespace marian {
 // GEMM type enum
 typedef enum {
   Auto = 0,            // auto tuning between available GEMMs
-  Float32 = 1,         // MKL based GEMM, fp32
+  Float32 = 1,         // fp32 based GEMM
   FbFp16Packed = 10,   // FBGEMM based fp16 GEMM with packing
   FbInt8Packed = 11    // FBGEMM based int8 GEMM with packing
 } GemmType;