[FutureWarning] Resolving the warning related to the use of a single-element series.

[drivanov]

Description

The current PR fixes the following warnings:

/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:91: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
  x1 = float(coords_1010[coords_1010.label == ref_sensor1]["x"])
/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:92: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
  y1 = float(coords_1010[coords_1010.label == ref_sensor1]["y"])
/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:93: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
  z1 = float(coords_1010[coords_1010.label == ref_sensor1]["z"])
/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:95: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
  x2 = float(coords_1010[coords_1010.label == ref_sensor2]["x"])
/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:96: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
  y2 = float(coords_1010[coords_1010.label == ref_sensor2]["y"])
/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:97: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
  z2 = float(coords_1010[coords_1010.label == ref_sensor2]["z"])
/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:91: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
  x1 = float(coords_1010[coords_1010.label == ref_sensor1]["x"])
/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:92: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
  y1 = float(coords_1010[coords_1010.label == ref_sensor1]["y"])
/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:93: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
  z1 = float(coords_1010[coords_1010.label == ref_sensor1]["z"])
/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:95: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
  x2 = float(coords_1010[coords_1010.label == ref_sensor2]["x"])
/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:96: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
  y2 = float(coords_1010[coords_1010.label == ref_sensor2]["y"])
/opt/dgl/dgl-source/examples/pytorch/eeg-gcnn/EEGGraphDataset.py:97: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead

Checklist

Please feel free to remove inapplicable items for your PR.

• The PR title starts with [$CATEGORY] (such as [NN], [Model], [Doc], [Feature]])
• I've leverage the tools to beautify the python and c++ code.
• The PR is complete and small, read the Google eng practice (CL equals to PR) to understand more about small PR. In DGL, we consider PRs with less than 200 lines of core code change are small (example, test and documentation could be exempted).
• To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Changes

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