How to use the cogdl.data.Data function in cogdl

for i, line in enumerate(context):
            edge_index[:, i] = list(map(int, line.strip().split("\t")))
    edge_index = torch.from_numpy(edge_index).to(torch.int)

    with open(cmty_path) as f:
        context = f.readlines()
        print("class number: ", len(context))
        label = np.zeros((num_node, len(context)))

        for i, line in enumerate(context):
            line = map(int, line.strip().split("\t"))
            for node in line:
                label[node, i] = 1

    y = torch.from_numpy(label).to(torch.float)
    data = Data(x=None, edge_index=edge_index, y=y)

    return data

valid_data[items[0]] = [[], []]
            valid_data[items[0]][1 - int(items[3])].append(
                [int(items[1]), int(items[2])]
            )

    test_data = {}
    with open(osp.join(folder, "{}".format("test.txt")), "r") as f:
        for line in f:
            items = line.strip().split()
            if items[0] not in test_data:
                test_data[items[0]] = [[], []]
            test_data[items[0]][1 - int(items[3])].append(
                [int(items[1]), int(items[2])]
            )

    data = Data()
    data.train_data = train_data
    data.valid_data = valid_data
    data.test_data = test_data
    return data

def collate(self, data_list):
        r"""Collates a python list of data objects to the internal storage
        format of :class:`cogdl.data.InMemoryDataset`."""
        keys = data_list[0].keys
        data = Data()

        for key in keys:
            data[key] = []
        slices = {key: [0] for key in keys}

        for item, key in product(data_list, keys):
            data[key].append(item[key])
            s = slices[key][-1] + item[key].size(item.cat_dim(key, item[key]))
            slices[key].append(s)

        for key in keys:
            data[key] = torch.cat(
                data[key], dim=data_list[0].cat_dim(key, data_list[0][key])
            )
            slices[key] = torch.LongTensor(slices[key])

import re

import torch
from cogdl.data import Data


class Batch(Data):
    r"""A plain old python object modeling a batch of graphs as one big
    (dicconnected) graph. With :class:`cogdl.data.Data` being the
    base class, all its methods can also be used here.
    In addition, single graphs can be reconstructed via the assignment vector
    :obj:`batch`, which maps each node to its respective graph identifier.
    """

    def __init__(self, batch=None, **kwargs):
        super(Batch, self).__init__(**kwargs)
        self.batch = batch

    @staticmethod
    def from_data_list(data_list):
        r"""Constructs a batch object from a python list holding
        :class:`cogdl.data.Data` objects.
        The assignment vector :obj:`batch` is created on the fly."""

def get(self, idx):
        data = Data()
        for key in self.data.keys:
            item, slices = self.data[key], self.slices[key]
            s = list(repeat(slice(None), item.dim()))
            s[self.data.cat_dim(key, item)] = slice(slices[idx], slices[idx + 1])
            data[key] = item[s]
        return data