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.