sklearn kneighbours内存错误python

Question

我正在使用 Windows 7 8gb RAM。

这是我用来对 52MB 训练数据集中的自由文本列进行矢量化的矢量化器

vec = CountVectorizer(analyzer='word',stop_words='english',decode_error='ignore',binary=True)

我想用这个数据集计算 18MB 测试集的 5 个最近邻。

nbrs = NearestNeighbors(n_neighbors=5).fit(vec.transform(data['clean_sum']))
vectors = vec.transform(data_test['clean_sum'])
distances,indices = nbrs.kneighbors(vectors)

这是堆栈跟踪 -

Traceback (most recent call last):
  File "cr_nearness.py", line 224, in <module>
    distances,indices = nbrs.kneighbors(vectors)
  File "C:\Anaconda2\lib\site-packages\sklearn\neighbors\base.py", line 371,
kneighbors
    n_jobs=n_jobs, squared=True)
  File "C:\Anaconda2\lib\site-packages\sklearn\metrics\pairwise.py", line 12
in pairwise_distances
    return _parallel_pairwise(X, Y, func, n_jobs, **kwds)
  File "C:\Anaconda2\lib\site-packages\sklearn\metrics\pairwise.py", line 10
in _parallel_pairwise
    return func(X, Y, **kwds)
  File "C:\Anaconda2\lib\site-packages\sklearn\metrics\pairwise.py", line 23
n euclidean_distances
    distances = safe_sparse_dot(X, Y.T, dense_output=True)
  File "C:\Anaconda2\lib\site-packages\sklearn\utils\extmath.py", line 181,
afe_sparse_dot
    ret = ret.toarray()
  File "C:\Anaconda2\lib\site-packages\scipy\sparse\compressed.py", line 940
 toarray
    return self.tocoo(copy=False).toarray(order=order, out=out)
  File "C:\Anaconda2\lib\site-packages\scipy\sparse\coo.py", line 250, in to
y
    B = self._process_toarray_args(order, out)
  File "C:\Anaconda2\lib\site-packages\scipy\sparse\base.py", line 817, in _
ess_toarray_args
    return np.zeros(self.shape, dtype=self.dtype, order=order)
MemoryError

有任何想法吗？

Answer 1

将 KNN 与 KD TREE 结合使用

模型 = KNeighborsClassifier(n_neighbors=5,算法='kd_tree').fit(X_train, Y_train)

模型默认为algorithm='brute'。brute false 占用太多内存。我认为对于你的模型来说应该是这样的

nbrs = NearestNeighbors(n_neighbors=5,algorithm='kd_tree').fit(vec.transform(data['clean_sum']))