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我想使用GridSearchCV与v_measure_score 和比较结果
用另一种方法无GridSearchCV。Sklearn - GridSearchCV与v_measure_score是不一样的
v_measure_score由for循环的最好成绩是0.69816019299与百分27;
最好成绩GridSearchCV是0.565562627046百分位数。
在我看来,结果应该是一样的。
我检查了我的代码几次,但仍然无法弄清楚原因。 以下是我的代码:
GridSearchCV
estimators = [('tfIdf', TfidfTransformer()), ('sPT', SelectPercentile()), ('kmeans', cluster.KMeans())]
pipe = Pipeline(estimators)
params = dict(tfIdf__smooth_idf=[True],
sPT__score_func= [f_classif], sPT__percentile=range(100, 0, -1),
kmeans__n_clusters=[clusterNum], kmeans__random_state=[0], kmeans__precompute_distances=[True])
v_measure_scorer = make_scorer(v_measure_score)
grid_search = GridSearchCV(pipe, param_grid=params, scoring=v_measure_scorer)
grid_search_fit = grid_search.fit(apiVectorArray, yTarget)
v_measure_score由环
bestPercent = [-1, -1]
for percent in xrange(100, 0, -1):
transformer = TfidfTransformer(smooth_idf=True)
apiVectorArrayTFIDF = transformer.fit_transform(apiVectorArray)
apiVectorFit = SelectPercentile(f_classif, percentile=percent).fit(apiVectorArrayTFIDF, yTarget)
k_means = cluster.KMeans(n_clusters=clusterNum, random_state=0, precompute_distances=True).fit(apiVectorFit.transform(apiVectorArrayTFIDF))
if v_measure_score(yTarget, k_means.labels_) > bestPercent[1]:
bestPercent[0] = percent
bestPercent[1] = v_measure_score(yTarget, k_means.labels_)
我想在我的代码添加颜色,但失败了。
对不起,你的眼睛。
谢谢。