GCN（一）数据集介绍
2024-05-19 13:17:37
1.数据集介绍
1.1 数据集概述
Cora数据集由机器学习论文组成，是近年来图深度学习很喜欢使用的数据集。在数据集中，论文分为以下七类之一:
- 基于案例
- 遗传算法
- 神经网络
- 概率方法
- 强化学习
- 规则学习
- 理论
论文的选择方式是，在最终语料库中，每篇论文引用或被至少一篇其他论文引用。整个语料库中有2708篇论文。
在词干堵塞和去除词尾后，只剩下1433个独特的单词。文档频率小于10的所有单词都被删除。
1.2 数据集组成
content文件：
content文件包含以下格式的论文描述:<paper_id> <word_attributes>+ <class_label>
每行的第一个条目包含纸张的唯一字符串标识，后跟二进制值，指示词汇中的每个单词在文章中是存在(由1表示)还是不存在(由0表示)。
最后，该行的最后一个条目包含论文的类别标签。因此数据集的feature应该为2708 × 1433 维度。第一列为idx，最后一列为label。
部分数据:
31336 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 Neural_Networks
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Cites文件
那个.cites文件包含语料库的引用’图’。每行以以下格式描述一个链接:<被引论文编号> <引论文编号>
每行包含两个论文id。第一个条目是被引用论文的标识，第二个标识代表包含引用的论文。链接的方向是从右向左。
如果一行由“论文1 论文2”表示，则链接是“论文2 - >论文1”。可以通过论文之间的索引关系建立邻接矩阵adj
部分数据：
35 1033
35 103482
35 103515
35 1050679
35 1103960
35 1103985
35 1109199
35 1112911
......
1.2如何读取
import numpy as np
import scipy.sparse as sp
import torchdef encode_onehot(labels):classes = set(labels)classes_dict = {c: np.identity(len(classes))[i, :] for i, c inenumerate(classes)}labels_onehot = np.array(list(map(classes_dict.get, labels)),dtype=np.int32)return labels_onehotdef load_data(path="../data/cora/", dataset="cora"):"""Load citation network dataset (cora only for now)"""print('Loading {} dataset...'.format(dataset))idx_features_labels = np.genfromtxt("{}{}.content".format(path, dataset),dtype=np.dtype(str))features = sp.csr_matrix(idx_features_labels[:, 1:-1], dtype=np.float32) # 座标格式,取特征featurelabels = encode_onehot(idx_features_labels[:, -1]) # one-hot label# build graphidx = np.array(idx_features_labels[:, 0], dtype=np.int32) # 节点idx_map = {j: i for i, j in enumerate(idx)} # 构建节点的索引字典edges_unordered = np.genfromtxt("{}{}.cites".format(path, dataset), # 导入edge的数据dtype=np.int32)edges = np.array(list(map(idx_map.get, edges_unordered.flatten())),dtype=np.int32).reshape(edges_unordered.shape) # 将之前的转换成字典编号后的边adj = sp.coo_matrix((np.ones(edges.shape[0]), (edges[:, 0], edges[:, 1])), # 构建边的邻接矩阵shape=(labels.shape[0], labels.shape[0]),dtype=np.float32)# build symmetric adjacency matrix，计算转置矩阵。将有向图转成无向图adj = adj + adj.T.multiply(adj.T > adj) - adj.multiply(adj.T > adj)features = normalize(features) # 对特征做了归一化的操作adj = normalize(adj + sp.eye(adj.shape[0])) # 对A+I归一化# 训练，验证，测试的样本idx_train = range(140)idx_val = range(200, 500)idx_test = range(500, 1500)# 将numpy的数据转换成torch格式features = torch.FloatTensor(np.array(features.todense()))labels = torch.LongTensor(np.where(labels)[1]) # 标签， np.where(labels)返回元组，第一个元组表示横坐标，第二个元组表示纵坐标adj = sparse_mx_to_torch_sparse_tensor(adj)idx_train = torch.LongTensor(idx_train)idx_val = torch.LongTensor(idx_val)idx_test = torch.LongTensor(idx_test)return adj, features, labels, idx_train, idx_val, idx_testdef normalize(mx):"""Row-normalize sparse matrix"""rowsum = np.array(mx.sum(1)) # 矩阵行求和r_inv = np.power(rowsum, -1).flatten() # 求和的-1次方r_inv[np.isinf(r_inv)] = 0. # 如果是inf，转换成0r_mat_inv = sp.diags(r_inv) # 构造对角戏矩阵mx = r_mat_inv.dot(mx) # 构造D-1*A，非对称方式，简化方式return mxdef accuracy(output, labels):preds = output.max(1)[1].type_as(labels)correct = preds.eq(labels).double()correct = correct.sum()return correct / len(labels)def sparse_mx_to_torch_sparse_tensor(sparse_mx):"""Convert a scipy sparse matrix to a torch sparse tensor."""sparse_mx = sparse_mx.tocoo().astype(np.float32)indices = torch.from_numpy(np.vstack((sparse_mx.row, sparse_mx.col)).astype(np.int64))values = torch.from_numpy(sparse_mx.data)shape = torch.Size(sparse_mx.shape)return torch.sparse.FloatTensor(indices, values, shape)
1.3 运行调试结果
- features：论文的属性特征，维度2708×14332708 \times 14332708×1433，并且做了归一化，即每一篇论文属性值的和为1.
- labels：每一篇论文对应的分类编号：0-6
- adj：邻接矩阵，维度2708×27082708 \times 27082708×2708
- idx_train：0-139
- idx_val：200-499
- idx_test：500-1499
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