clean up

paddle/fluid/platform/device_tracer.cc

@@ -276,15 +276,12 @@ class DeviceTracerImpl : public DeviceTracer {
     std::string kernel_name;
     for (const KernelRecord &r : kernel_records_) {
       if (correlations_.find(r.correlation_id) == correlations_.end()) {
-        // fprintf(stderr, "cannot relate a kernel activity\n");
-        // continue;
-        kernel_name = "Unknown";
-      } else {
-        kernel_name = correlations_.at(r.correlation_id);
+        fprintf(stderr, "cannot relate a kernel activity\n");
+        continue;
       }
       auto *event = profile_pb.add_events();
       event->set_type(proto::Event::GPUKernel);
-      event->set_name(kernel_name);
+      event->set_name(correlations_.at(r.correlation_id));
       event->set_start_ns(r.start_ns);
       event->set_end_ns(r.end_ns);
       event->set_sub_device_id(r.stream_id);