message: Improving snapshot's logging
diff: @@ -567,7 +567,7 @@ class SnapshotDatasetOp : public UnaryDatasetOpKernel {
  kbytes_read_ += static_cast<double>(num_bytes) / 1024.0;
  elements_produced_++;
  if (elements_produced_ % 10000 == 0) {
  - VLOG(2) << "Current read throughput (MBPS): "
  + LOG(INFO) << "Current read throughput (MBPS): "
  << ((kbytes_read_ / 1024.0) /
  (time_spent_micros_ / 1000000.0));
  }
  @@ -802,7 +802,7 @@ class SnapshotDatasetOp : public UnaryDatasetOpKernel {
  elements_produced_++;
  if (elements_produced_ % 10000 == 0) {
  - VLOG(2) << "Current write throughput (MBPS): "
  + LOG(INFO) << "Current write throughput (MBPS): "
  << (bytes_produced_ * 1000000.0) /
  (time_spent_micros_ * 1024.0 * 1024.0);
  }
  