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I have tried to clone coco API to download a specific class from coco dataset, but when I run codes in Google Colaboratory, it gives me this error: name 'coco' is not defined .

!git clone https://github.com/philferriere/cocoapi
#display COCO categories
cats = coco.loadCats(coco.getCatIds())
nms=[cat['name'] for cat in cats]
print('COCO categories: \n{}\n'.format(' '.join(nms)))
# get all images containing given categories (I'm selecting the "bird")
catIds = coco.getCatIds(catNms=['bird']);
imgIds = coco.getImgIds(catIds=catIds);
I think this is from the example in https://github.com/philferriere/cocoapi/blob/master/PythonAPI/demos/pycocoDemo.ipynb
And you need to copy some more lines: 
from pycocotools.coco import COCO
# ... skipped some lines here
# initialize COCO api for instance annotations
coco=COCO(annFile)
cats = coco.loadCats(coco.getCatIds())
nms=[cat['name'] for cat in cats]
print('COCO categories: \n{}\n'.format(' '.join(nms)))
# get all images containing given categories (I'm selecting the "bird")
catIds = coco.getCatIds(catNms=['bird']);
imgIds = coco.getImgIds(catIds=catIds);
        
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