小编Nia*_*dle的帖子

我使用 ElasticNet 进行了网格搜索，但无法绘制热图以查看 alpha 和 l1 比率之间的关系。我能够到达pivot_table，但我不知道如何使用热图对其进行可视化。有人可以帮忙吗？

我的代码：

from sklearn.datasets import fetch_california_housing
cal=fetch_california_housing()

X = cal.data
y = cal.target 
from sklearn.model_selection import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X, y, random_state=0)

import matplotlib.pyplot as plt
%matplotlib inline

param_grid = {'alpha': np.logspace(-3, -1, 10), 'l1_ratio':[0.01, .1, .9, 
.98, 1]}
print(param_grid)
grid = GridSearchCV(ElasticNet(normalize=True), param_grid, cv=10)
grid.fit(X_train, y_train)
print("Best cross-validation score: {:.2f}".format(grid.best_score_))
print("Best parameters: ", grid.best_params_)

import pandas as pd
pvt = pd.pivot_table(pd.DataFrame(grid.cv_results_),
    values='mean_test_score', index='param_alpha', columns='param_l1_ratio')

pvt

我想实现这样的目标：

我试图以编程方式将收集单元格的大小设置为框架的宽度,但是,当我运行应用程序时,单元格大小不会改变.这是调用Swift 4和Xcode 9的正确功能吗？

import UIKit

class SettingsLauncher: NSObject, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewFlowLayout {    
    let blackView = UIView()

    let collectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
        cv.backgroundColor = UIColor.white
        return cv
    }()

    let cellID = "cell"

    @objc func showMenu() {
        // Show menu

        if let window = UIApplication.shared.keyWindow { // Get the size of the entire window

            blackView.backgroundColor = UIColor(white: 0, alpha: 0.5)

            let height: CGFloat = 200
            let y = window.frame.height - height …

我正在使用For循环来循环包含百分比的数组中的变量.对于每个值,我通过一个等式给出了所有百分比的平均值.唯一的问题是我不确定如何更改变量类型以容纳小数,同时也可以使用我的方程式.

// Calculate average of all percentages for specific exercise
long totalNumber = 0;
int temp;
long numberOfObjects = [iterationArray count];
for (NSArray *object in iterationArray) {
    temp = [(NSNumber *)[object objectAtIndex:4] intValue]/100;
    totalNumber = totalNumber + temp;
}
exercisePercentage = (totalNumber/numberOfObjects)*100;

return exercisePercentage;

我知道这temp是需要小数的变量.我正在考虑使用NSDecimalNumber但不知道如何适应其余的代码来返回long值.

尽管事实上是80 ,但我已经尝试过制造一个double或者float两个都返回0 .temp = [(NSNumber *)[object objectAtIndex:4] intValue]/100;[(NSNumber *)[object objectAtIndex:4] intValue]