Update README.MD

ogb_examples/nodeproppred/unipm/README.MD

@@ -39,7 +39,7 @@ Arxiv_dataset(Full Batch):          Products_dataset(NeighborSampler):
 
 | Model              |Test Accuracy    |Valid Accuracy   | Parameters    | Hardware |
 | ------------------ |--------------   | --------------- | -------------- |----------|
-| Arxiv_baseline     | $$0.7225 \pm 0.0015$$ | $$0.7367 \pm 0.0012$$ | 468,369  | Tesla V100 (32GB) |
+| Arxiv_baseline     | $0.7225 \pm 0.0015$ | $$0.7367 \pm 0.0012$$ | 468,369  | Tesla V100 (32GB) |
 | Arxiv_UniPM        | $$0.7311 \pm 0.0021$$ | $$0.7450 \pm 0.0005$$ | 473,489 | Tesla V100 (32GB) |
 | Products_baseline  | $$0.8023 \pm 0.0026$$ | $$0.9286 \pm 0.0017$$ | 1,470,905  | Tesla V100 (32GB) |
 | Products_UniPM     | $$0.8256 \pm 0.0031$$ | $$0.9308 \pm 0.0017$$ | 1,475,605  | Tesla V100 (32GB) |