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#将某个矩阵中的负值变为0
neg = feats < 0.0
rows,cols,_ = scipy.sparse.find(neg)
feats[rows,cols] = 0.0

#pickle.dump()和pickle.load()方法分别是将python对象序列化到文件中和从文件反序列化出对象
with open(file,'wb') as f:
  pkl.dump(obj,f)

with open(file,'rb') as f:
  pkl.load(f)