diff --git a/tensorflow/core/kernels/boosted_trees/resource_ops.cc b/tensorflow/core/kernels/boosted_trees/resource_ops.cc
index 376679d2e38..efb0d10c220 100644
--- a/tensorflow/core/kernels/boosted_trees/resource_ops.cc
+++ b/tensorflow/core/kernels/boosted_trees/resource_ops.cc
@@ -54,6 +54,16 @@ class BoostedTreesCreateEnsembleOp : public OpKernel {
     std::unique_ptr<BoostedTreesEnsembleResource> result(
         new BoostedTreesEnsembleResource());
     tstring tst = tree_ensemble_serialized_t->scalar<tstring>()();
+    std::cerr << "Got a string of " << tst.size() << " characters, of type " << tst.type() << "\n";
+    const char* tst_data = tst.data();
+    for (int i = 0; i < tst.size(); i++) {
+      fprintf(stderr, "%02x ", tst_data[i]);
+      if (i % 16 == 15)
+        fprintf(stderr, "\n");
+      else if (i % 8 == 7)
+        fprintf(stderr, "  ");
+    }
+    fprintf(stderr, "\n");
     std::cerr << "BoostedTreesCreateEnsembleOp::Compute V\n";
     if (!result->InitFromSerialized(tst, stamp_token)) {
       std::cerr << "BoostedTreesCreateEnsembleOp::Compute ^(1)\n";
diff --git a/tensorflow/core/kernels/boosted_trees/resources.cc b/tensorflow/core/kernels/boosted_trees/resources.cc
index be5d30ddb08..6d80a177c4e 100644
--- a/tensorflow/core/kernels/boosted_trees/resources.cc
+++ b/tensorflow/core/kernels/boosted_trees/resources.cc
@@ -40,11 +40,13 @@ bool BoostedTreesEnsembleResource::InitFromSerialized(const string& serialized,
   std::cerr << "Got a string of " << serialized.size() << " characters\n";
   const char* serialized_data = serialized.data();
   for (int i = 0; i < serialized.size(); i++) {
-    std::cerr << reinterpret_cast<int>(serialized_data[i]) << " ";
-    if (i % 10 == 9)
-      std::cerr << "\n";
+    fprintf(stderr, "%02x ", serialized_data[i]);
+    if (i % 16 == 15)
+      fprintf(stderr, "\n");
+    else if (i % 8 == 7)
+      fprintf(stderr, "  ");
   }
-  std::cerr << "\n";
+  fprintf(stderr, "\n");
   CHECK_EQ(stamp(), -1) << "Must Reset before Init.";
   std::cerr << "ParseProtoUnlimited...\n";
   if (ParseProtoUnlimited(tree_ensemble_, serialized)) {