why tuple under function definition?

[happynewya]

In models.py, there are lots of tuple-under-function style code.
for example, _vgg_fc()

 55     def _vgg_fc(self):
 56         (self.feed('conv_out', 'rois')
 57              .roi_pool(7, 7, 1.0/16, name='pool5')
 58              .fc(4096, name='fc6')
 59              .dropout(self.keep_prob, name='drop6')
 60              .fc(4096, name='fc7')
 61              .dropout(self.keep_prob, name='vgg_out'))

I wonder what is the different from the code below?

 55     def _vgg_fc(self):
 56         self.feed('conv_out', 'rois')
 57              .roi_pool(7, 7, 1.0/16, name='pool5')
 58              .fc(4096, name='fc6')
 59              .dropout(self.keep_prob, name='drop6')
 60              .fc(4096, name='fc7')
 61              .dropout(self.keep_prob, name='vgg_out')

[danfeiX]

This is how Python deals with chained function calls: https://stackoverflow.com/questions/4768941/how-to-break-a-line-of-chained-methods-in-python/4769685