[GraphBolt] Default value of persistent_workers should be False

[Rhett-Ying]

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Project tracker: https://github.com/orgs/dmlc/projects/2

Description

As gb.DataLoader inherits from torch.utils.data.DataLoader(https://pytorch.org/docs/stable/data.html#torch.utils.data.DataLoader), the default value of persistent_workers should be same. But for now, we're using True while torch uses False.

Depending work items or issues

[frozenbugs]

dgl/python/dgl/graphbolt/dataloader.py

Line 58 in 41a3848

def __init__(self, datapipe, num_workers=0, persistent_workers=True):