如何在brat中按偏移量对注释进行排序？

Question

当使用快速注释器工具brat时，所创建的注解文件似乎将按照用户执行注解的顺序来呈现注解。如果您从文档的开头开始执行批注，那么批注自然会以正确的偏移顺序进行。但是，如果需要在文档的较早位置添加另一个批注，则输出.ann文件中批注的偏移顺序将会打乱。

那么，如何重新排列.ann文件，以便在完成时使注释按偏移量顺序排列？在brat中有没有什么选项可以让你这样做呢，还是需要编写自己的脚本来执行？

Answer 1

我什么也没听到，就写了一个python脚本来完成我打算做的事情。首先，我按照begin index对所有注释进行重新排序。其次，我对标签编号进行了重新排序，以便它们再次按升序排列。

import optparse, sys

splitchar1 = '\t'
splitchar2 = ' '

# for brat, overlapped is not permitted (or at least a warning is generated)
# we could use this simplification in sorting by simply sorting on begin.  it is
# probably a good idea anyway.
class AnnotationRecord:
    label = 'T0'
    type = ''
    begin = -1
    end = -1
    text = ''

    def __repr__(self):
        return self.label + splitchar1
             + self.type + splitchar2
             + str(self.begin) + splitchar2
             + str(self.end) + splitchar1 + self.text

def create_record(parts):
    record = AnnotationRecord()
    record.label = parts[0]
    middle_parts = parts[1].split(splitchar2)
    record.type = middle_parts[0]
    record.begin = middle_parts[1]
    record.end = middle_parts[2]
    record.text = parts[2]
    return record

def main(filename, out_filename):
    fo = open(filename, 'r')
    lines = fo.readlines()
    fo.close()

    annotation_records = []

    for line in lines:
        parts = line.split(splitchar1)
        annotation_records.append(create_record(parts))

    # sort based upon begin    
    sorted_records = sorted(annotation_records, key=lambda a: int(a.begin))

    # now relabel based upon the sorted order
    label_value = 1
    for sorted_record in sorted_records:
        sorted_record.label = 'T' + str(label_value)
        label_value += 1

    # now write the resulting file to disk
    fo = open(out_filename, 'w')
    for sorted_record in sorted_records:
        fo.write(sorted_record.__repr__())        
    fo.close()


#format of .ann file is T# Type Start End Text
#args are input file, output file
if __name__ == '__main__':
    parser = optparse.OptionParser(formatter=optparse.TitledHelpFormatter(), 
                                   usage=globals()['__doc__'],
                                   version='$Id$')
    parser.add_option ('-v', '--verbose', action='store_true',
                       default=False, help='verbose output')
    (options, args) = parser.parse_args()
    if len(args) < 2:
        parser.error ('missing argument')
    main(args[0], args[1])
    sys.exit(0)