Added printing tensor's format if oneDNN is used (#34021)

* added printing tensor's format

* added suggested changes

paddle/fluid/framework/tensor_util.cc

@@ -24,6 +24,9 @@ limitations under the License. */
 #include "paddle/fluid/framework/data_type.h"
 #include "paddle/fluid/platform/complex.h"
 #include "paddle/fluid/platform/profiler.h"
+#ifdef PADDLE_WITH_MKLDNN
+#include "dnnl_debug.h"
+#endif
 
 namespace paddle {
 namespace framework {
@@ -1177,6 +1180,11 @@ std::ostream& operator<<(std::ostream& os, const Tensor& t) {
   os << "  - shape: [" << t.dims() << "]\n";
   os << "  - layout: " << DataLayoutToString(t.layout()) << "\n";
 
+#ifdef PADDLE_WITH_MKLDNN
+  os << "  - format: "
+     << dnnl_fmt_tag2str(static_cast<dnnl_format_tag_t>(t.format())) << "\n";
+#endif
+
   Tensor tensor;
   tensor.Resize(t.dims());
   if (platform::is_cpu_place(t.place())) {