cross entropy
交叉熵
化交叉熵
Cross-Entropy Loss functions are optimized using Gradient Descent.In classification trees, we use cross-entropy and Gini index. 这里采用了交叉熵 (cross-entropy)来作为costfunction。 Use Cross entropy as the cost function. Logistic回归:模型,交叉熵 损失,类概率估计。 Logistic regression: model, cross-entropy loss, class probability estimation. In classification trees, we use cross-entropy and Gini index. Combinations with other parts of speech
Then we can implement the cross-entropy function:. Also called the cross entropy loss. If we were dealing with a classification outcome, we might use cross-entropy . In the classification task, the cross entropy loss function is commonly used. And now you can compute your cross-entropy in a safe way:. Formal definition of the cross-entropy . The cross entropy is defined as.Why is the cross-entropy the right distance to use for classification problems? The cross-entropy error function is defined as follows:.Roughly speaking, the idea is that the cross-entropy is a measure of surprise. 我们引入了交叉熵 基准测试来获得复杂多比特动力学的实验保真度。 We introduce cross-entropy benchmarking to obtain the experimental fidelity of complex multiqubit dynamics. We use categorical cross entropy as the loss function, which is widely used in classification problems. 熵,交叉熵 和KL-散度经常用于机器学习,特别是用于训练分类器。 Entropy, cross-entropy and KL-divergence are often used in machine learning, in particular for training classifiers. 交叉熵 是一个用来比较两个概率分布p和q的数学工具。Cross entropy is a mathematical tool for comparing two probability distributions p and q. The cross-entropy is measuring how inefficient our predictions are for describing the truth. 我们也选择二进制--交叉熵 作为损失(因为我们处理二进制分类)和准确性作为我们的评估指标。 We also choose binary- cross entropy as the loss(because we deal with binary classification) and accuracy as our evaluation index. 在本章中我们主要使用交叉熵 代价函数来解决学习速度衰退的问题。 In this chapter we will mostly use the cross-entropy cost to address the problem of learning slowdown. 在训练循环中使用该代码训练数据计算精度和交叉熵 (例如每10次迭代):. The accuracy and cross entropy are computed on training data using this code in the training loop(every 10 iterations for example):. 为了实现交叉熵 ,我们需要先添加一个新的占位符来输入正确答案:. To implement cross-entropy we need to first add a new placeholder to input the correct answers:. 二分类问题:对数损失(也称为交叉熵 )“_binarycrossentropy”。 Binary Classification(2 class): Logarithmic Loss, also called cross entropy or‘binary_crossentropy‘. 在这副图片当中,交叉熵 被表示为一个具有两个权重的函数。 In this picture, cross-entropy is represented as a function of 2 weights. 损失函数(lossfunction,此处为「交叉熵 」)的选择稍后会做出解释。 The choice of a loss function(here,"cross-entropy ") is explained later. Since the true distribution is unknown, cross-entropy cannot be directly calculated.
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