You can find here class names files for the different supported datasets.
Text file listing Pascal VOC class names in the correct order: voc.names.
Text file listing COCO class names in the correct order: coco.names.
There aren’t much pre-trained models available on Imagenet for Object Detection, so we’ve trained our own model specificaly for person class.
So just create a file with one entry person or just use this file.
Faster R-CNN model for the same class names file here .
Open Images dataset
You can find Open Images dataset class names here.