在 Raspberry Pi 3 上运行 scrapy 时收到错误。
我已经成功安装了它,但是当我尝试使用之前创建的蜘蛛启动项目或爬行时,出现以下错误:
Traceback (most recent call last):
File "/usr/local/bin/scrapy", line 7, in <module>
from scrapy.cmdline import execute
File "/usr/local/lib/python3.4/dist-packages/scrapy/cmdline.py", line 9, in <module>
from scrapy.crawler import CrawlerProcess
File "/usr/local/lib/python3.4/dist-packages/scrapy/crawler.py", line 7, in <module>
from twisted.internet import reactor, defer
File "/usr/local/lib/python3.4/dist-packages/twisted/internet/reactor.py", line 38, in <module>
from twisted.internet import default
File "/usr/local/lib/python3.4/dist-packages/twisted/internet/default.py", line 56, in <module>
install = _getInstallFunction(platform)
File "/usr/local/lib/python3.4/dist-packages/twisted/internet/default.py", line 44, in _getInstallFunction
from twisted.internet.epollreactor import install
File "/usr/local/lib/python3.4/dist-packages/twisted/internet/epollreactor.py", line 24, in <module>
from …Run Code Online (Sandbox Code Playgroud) 我正在努力从我的RandomForestRegressor中提取功能的重要性,我得到了:
AttributeError:“ GridSearchCV”对象没有属性“ feature_importances_”。
有人知道为什么没有属性吗?根据文档,应该存在此属性?
完整代码:
from sklearn.ensemble import RandomForestRegressor
from sklearn.model_selection import GridSearchCV
#Running a RandomForestRegressor GridSearchCV to tune the model.
parameter_candidates = {
'n_estimators' : [650, 700, 750, 800],
'min_samples_leaf' : [1, 2, 3],
'max_depth' : [10, 11, 12],
'min_samples_split' : [2, 3, 4, 5, 6]
}
RFR_regr = RandomForestRegressor()
CV_RFR_regr = GridSearchCV(estimator=RFR_regr, param_grid=parameter_candidates, n_jobs=5, verbose=2)
CV_RFR_regr.fit(X_train, y_train)
#Predict with testing set
y_pred = CV_RFR_regr.predict(X_test)
#Extract feature importances
importances = CV_RFR_regr.feature_importances_
Run Code Online (Sandbox Code Playgroud) python feature-extraction random-forest scikit-learn grid-search
我在反应本机中有一个平面列表,我试图在拉下它时重新获取数据(本机刷新功能)。当我这样做时,我收到此错误:
类型错误:未定义不是对象
我不知道出了什么问题。我在用
这是我的代码:
export default function DiscoverFeed({ navigation }) {
const theme = useTheme();
const { data, error, loading, refetch, fetchMore, networkStatus } = useQuery(
GET_RECIPE_FEED,
{
variables: { offset: 0 },
notifyOnNetworkStatusChange: true,
}
);
if (error) return <Text>There was an error, try and reload.</Text>;
if (loading) return <Loader />;
if (networkStatus === NetworkStatus.refetch) return <Loader />;
const renderItem = ({ item }) => {
return (
<View style={styles.cardItems}>
<RecipeCard item={item} …Run Code Online (Sandbox Code Playgroud) 我的挑战是在我已有的散点图上覆盖自定义线函数图,代码如下所示:
base_beta = results.params
X_plot = np.linspace(0,1,400)
g = sns.FacetGrid(data, size = 6)
g = g.map(plt.scatter, "usable_area", "price", edgecolor="w")
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其中base_beta只有一个常数,然后是一个系数。基本上,我想覆盖一个绘制一条线的函数y = constant + coefficient * x
我试图用这个覆盖一条线,但它没有用。
g = g.map_dataframe(plt.plot, X_plot, X_plot*base_beta[1]+base_beta[0], 'r-')
plt.show()
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谁能帮我这个?
--尝试 1
base_beta = results.params
X_plot = np.linspace(0,1,400)
Y_plot = base_beta [0] + base_beta[1]*X_plot
g = sns.FacetGrid(data, size = 6)
g = g.map(plt.scatter, "usable_area", "price", edgecolor="w")
plt.plot(X_plot, Y_plot, color='r')
plt.show()
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我想使用项目加载器的正则表达式,但我无法弄清楚如何.
通常情况下,它只是如此追加到最后:
response.xpath('*xpath*').re(*expression*)
Run Code Online (Sandbox Code Playgroud)
但是如果项目加载器不起作用,请尝试如下:
Loader.add_xpath('item', '*xpath*').re(*expression*)
Run Code Online (Sandbox Code Playgroud)
也尝试使用item.py中的MapCompose,但也没有让它工作.有人知道如何使用Item加载器使用正则表达式吗?
python ×3
scrapy ×2
grid-search ×1
matplotlib ×1
raspberry-pi ×1
react-native ×1
regex ×1
scikit-learn ×1
seaborn ×1