读取igraph和NetworkX中缺少数据的GML文件时出错

Question

我有一组网络，其中包含一些缺少的节点属性数据。我需要能够访问igraph、NetworkX和Gephi中的这些网络。我知道我可以在GML中将缺少的值记录为NAN，igraph会理解它，但NetworkX不会（有此错误消息：networkx.exception.NetworkXError: expected an int, float, string or '[', found 'NAN' at (16, 9)）

GML文件如下所示（称为“export.GML”）：

graph [
  directed 1
  node [
    id 0
    label "1"
    age 1
  ]
  node [
    id 1
    label "2"
    age 2
  ]
  node [
    id 2
    label "3"
    age "NA"
  ]
  edge [
    source 0
    target 1
  ]
  edge [
    source 1
    target 2
  ]
  edge [
    source 2
    target 0
  ]
]

我可以在Python的igraph中打开此文件，直到最近我还可以在R中打开类似的文件。到今天为止，我首先在Python中得到的是：

>>> import igraph
>>> g = igraph.read("export.gml")
>>> g.vs["age"]
['1', '2', 'NA']

然后在R中：

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> library(igraph)

Attaching package: ‘igraph’

The following objects are masked from ‘package:stats’:

    decompose, spectrum

The following object is masked from ‘package:base’:

    union

> igraph_version()
[1] "1.2.6"
> g <- read_graph("export.gml", format = "gml")

 *** caught segfault ***
address (nil), cause 'memory not mapped'

Traceback:
 1: read.graph.gml(file, ...)
 2: read_graph("export.gml", format = "gml")

Possible actions:
1: abort (with core dump, if enabled)
2: normal R exit
3: exit R without saving workspace
4: exit R saving workspace
Selection: 

有没有办法在igraph中打开此文件？或者，有没有办法让NetworkX正确解释GML文件中的NAN