tf.keras.metrics.sparse_categorical_accuracy
时间: 2024-05-30 12:15:49 浏览: 132
基于sparse coding的分类程序
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tf.keras.metrics.sparse_categorical_accuracy is a metric used in Keras to calculate the accuracy of a classification model that uses sparse categorical cross-entropy as its loss function. It is typically used when the labels are integers and not one-hot encoded.
The sparse categorical accuracy calculates the accuracy of the model's predictions by comparing the highest predicted class index with the true class index for each input sample. It then averages the number of correct predictions over the total number of samples.
This metric is commonly used in multi-class classification tasks where the number of classes is large and one-hot encoding the labels is not practical due to memory constraints.
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