sklearn Logistic Regression “ValueError: Found array with dim 3. Estimator expected <= 2.”

问题:

I attempt to solve this problem 6 in this notebook. The question is to train a simple model on this data using 50, 100, 1000 and 5000 training samples by using the LogisticRegression model from sklearn.linear_model. https://github.com/tensorflow/tensorflow/blob/master/tensorflow/examples/udacity/1_notmnist.ipynb

lr = LogisticRegression() lr.fit(train_dataset,train_labels) 

This is the code i trying to do and it give me the error. ValueError: Found array with dim 3. Estimator expected

Any idea?

回答1:

scikit-learn expects 2d num arrays for the training dataset for a fit function. The dataset you are passing in is a 3d array you need to reshape the array into a 2d.

nsamples, nx, ny = train_dataset.shape d2_train_dataset = train_dataset.reshape((nsamples,nx*ny)) 

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