问题描述
我有几个 MongoDB 文档,其中一个字段最好表示为矩阵(numpy 数组).我想将此文档保存到 MongoDB,我该怎么做?
I have a couple of MongoDB documents wherein one my the fields is best represented as a matrix (numpy array). I would like to save this document to MongoDB, how do I do this?
{ 'name' : 'subject1', 'image_name' : 'blah/foo.png', 'feature1' : np.array(...) }
推荐答案
对于一维 numpy 数组,可以使用列表:
For a 1D numpy array, you can use lists:
# serialize 1D array x record['feature1'] = x.tolist() # deserialize 1D array x x = np.fromiter( record['feature1'] )
对于多维数据,我相信你需要使用pickle和pymongo.binary.Binary:
For multidimensional data, I believe you'll need to use pickle and pymongo.binary.Binary:
# serialize 2D array y record['feature2'] = pymongo.binary.Binary( pickle.dumps( y, protocol=2) ) ) # deserialize 2D array y y = pickle.loads( record['feature2'] )