使用Array.reduce()计算值的平均值、方差和方差的总和, 值的方差, 然后确定标准偏差。可以省略第二个参数以获取样本标准偏差, 或将其设置为true以获取总体标准偏差。 const standardDeviation = (arr, usePopulation = false) => { const mean = arr.reduce((acc, val) => acc + val, 0) / arr.length;...
Buffer 是一个像 Array 的对象,主要用来操作字节。Buffer 是一个典型的 JavaScript 与 C++ 结合的模块,它将性能相关的部分用 C++ 实现,将非性能相关的部分用 JavaScript 实现。 Buffer 所占用的内存不是通过 V8 分配的,而是堆外内存。由于 V8 垃圾回收性能的影响,将 Buffer 对象用更高效的专有内存分配回收策略来...
*/asynctrainModel(xs,ys){constlayers=tf.layers.dense({units:1,// Dimensionality of the output spaceinputShape:[1],// Only one param});constlossAndOptimizer={loss:'meanSquaredError',optimizer:'sgd',// Stochastic gradient descent};this.linearModel=tf.sequential();this.linearModel.add(layers)...
For a radar chart, usually you will want to show a label on each point of the chart, so we include an array of strings that we show around each point in the chart. If you do not want this, you can either not include the array of labels, or choose to hide them in the chart opt...
Immutable.js is a library designed for the creation of immutable collections of data. It is commonly used in React/Redux development. Immutable.js was created by Facebook. What does immutable mean? Objects that can’t be modified after creation are considered immutable objects, as their state ...
说明下:Greenwich Mean Time (GMT)格林尼治标准时间英国、爱尔兰、冰岛和葡萄牙属于该时区。这个时区与中国北京时间的时差是8个小时,也就是说比北京时间晚8个小时。 Date构造函数 Date构造函数会模仿Date.UTC(),但有一点不同的是,日期和时间都是基于本地时区而非GMT来创建。不过他们的参数跟Date.UTC()的参数一样...
@JS('Object.keys')externalJSArray<JSString>keys(JSObjecto); TheJSObject()constructor replaces thenewObjectmethod. You could write your own interop extension type forObjectwith anexternalconstructor to do this as well, but it's not worth the extra code. ...
It could also mean that Channels is down failed Channels is not supported by the browser. This implies that WebSockets are not natively available and an HTTP-based transport could not be found. disconnected The Channels connection was previously connected and has now intentionally been closed. ...
I prefer using PhoneNumber.isPossible() instead of PhoneNumber.isValid(), so that it just validates the phone number length, and doesn't validate the actual phone number digits. But it doesn't mean that you shouldn't use PhoneNumber.isValid()— maybe in your case it would make sense....
mean the previous digit has to rounded up. for (; ++xc[--sd] > 9;) { xc[sd] =0; if (sd === 0{ ++x.e; xcunshift(1);break; } } } // Remove trailing zeros. for (sd = xc.length;!xc[--sd];) xc.pop(); } x; }/...