我有一个由以下文件表示的图表:
- VertexLabel.txt -> 每行包含每个顶点的属性。
- EdgeLabel.txt -> 每行包含每条边的属性。
- EdgeID.txt -> 每行包含 3 个分隔的整数,对应于标签文件中的索引:
源索引 目标索引 边缘索引。
大约有 44K 个顶点和 240K 个边。我正在尝试使用Neo4j.Writebatch http://nigelsmall.com/py2neo/1.6/batches/批量插入图形数据。
from py2neo import Graph, neo4j, node, rel
graph_db = Graph()
nodes = {}
batchNodes = {}
edges = {}
edgeList = []
# Read vertex label file into nodes, where node[i] is indexed according to the order the nodes appear in the file.
# Each entry is of type node, e.g. node("FILM", title = "Star Trek"), node("CAST", name = "William Shatner")
...
# Read edge label file into edges, where edges[i] is indexed according to the order the edges appear in the file.
# Each entry is a tuple (edge_type, edge_task), e.g. ("STAFF", "Director")
...
# Read edge id file into edgeList
# Each entry is the tuple (source_index, target_index, edge_index), e.g. (1, 4, 8)
...
# Iterate nodes, store in graph
# Note, store result of batch.create into batchNodes
batch = neo4j.WriteBatch(graph_db)
count = 0
for n in nodes:
batchNodes[n] = batch.create(nodes[n])
count += 1
# Submit every 500 steps
if count % 500 == 0:
count = 0
batch.submit()
batch = neo4j.WriteBatch(graph_db)
# Submit remaining batch
batch.submit()
# Iterate edgeList, store in graph
batch = neo4j.WriteBatch(graph_db)
count = 0
for i, j, k in edgeList:
# Lookup reference in batchNodes
source = batchNodes[i]
target = batchNodes[j]
edge = edges[k]
batch.create(rel(source, edge[0], target, {"task": edge[1]}))
count += 1
# Submit every 500 steps
if count % 500 == 0:
count = 0
batch.submit()
batch = neo4j.WriteBatch(graph_db)
# Submit remaining batch
batch.submit()
我收到以下错误:
Traceback (most recent call last): File "test4.py", line 87, in <module>
batch.create(rel(source, edge[0], target, {"task": edge[1]})) File "C:\Python34\lib\site-packages\py2neo\batch\write.py", line 181, in create
start_node = self.resolve(entity.start_node) File "C:\Python34\lib\site-packages\py2neo\batch\core.py", line 374, in resolve
return NodePointer(self.find(node)) File "C:\Python34\lib\site-packages\py2neo\batch\core.py", line 394, in find
raise ValueError("Job not found in batch") ValueError: Job not found in batch
我认为batchNodes实际上并不包含对我想要查找以添加关系的节点的正确引用(可能重新初始化批处理对象会使引用无效)。在这种情况下,我该如何执行这个任务呢?
我正在使用 Neo4j 2.1.7(社区版)和 py2neo 2.0.4。