René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"uncertainty query for 2d classifier output","articleBody":"Hello,\r\n\r\nThank you a lot for developing modAL and making it available ! :pray: \r\n\r\nThough recently, I encountered an error and wonder if the proposed solution fits.\r\n\r\nWhile running this line\r\n`learner.query(self.X_pool, n_instances=n)`\r\n\r\nThis error occurs\r\n\r\n\u003e \"modAL/models/base.py\", line 189, in query\r\n\u003e     return query_result, retrieve_rows(X_pool, query_result)\r\n\u003e                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n\u003e \"modAL/utils/data.py\", line 122, in retrieve_rows\r\n\u003e     raise TypeError(\"%s datatype is not supported\" % type(X))\r\n\u003e TypeError: \u003cclass 'numpy.ndarray'\u003e datatype is not supported\r\n\u003e \r\n\r\nHere is some context: \r\n- n = 20\r\n- X_pool.shape = (26, 384)\r\n- there are 35 classes in learner with KNeighborClassifier, it's multi-label setting.\r\n\r\nSo `classifier.predict_proba` returns 2D output for each class: list of 35 ndarrays of shape (26,2), which is not taken into account  in `classifier_uncertainty` function from `ModAL/uncertainty.py`\r\n\r\nIn case of `NotFittedError` the function will return an array (26, 1), while if the model is fitted, it returns (35,2) instead of (26, 2)\r\n\r\nIt seems that adding a small piece of code should help:\r\n\r\n```\r\nclasswise_uncertainty = np.array(classwise_uncertainty)\r\nif len(classwise_uncertainty.shape)\u003e2: # or if classifier.estimator.outputs_2d_:\r\n    classwise_uncertainty = classwise_uncertainty.max(axis=0)\r\n\r\n```\r\nMaybe there is a better solution for using multi-label classification ?\r\n\r\nThank you in advance :raised_hands: ","author":{"url":"https://github.com/liednik","@type":"Person","name":"liednik"},"datePublished":"2024-03-13T14:41:14.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/185/modAL/issues/185"}