April 2020
Intermediate to advanced
816 pages
18h 32m
Chinese
Content preview from 精通機器學習
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第二章：端對端機器學習專案
tgz_path = os.path.join(housing_path, "housing.tgz")
urllib.request.urlretrieve(housing_url, tgz_path)
housing_tgz = tarfile.open(tgz_path)
housing_tgz.extractall(path=housing_path)
housing_tgz.close()
現在當你呼叫
fetch_housing_data()
時
，
它會在你的工作區建立一個
datasets/housing
目
錄
，
下載
housing.tgz，
並且在這個目錄裡面取出
housing.csv。
接著我們要用
pandas
載入資料
，
你一樣應該寫一個小函式來載入資料
：
import pandas as pd
def
load_housing_data(housing_path=HOUSING_PATH):
csv_path = os.path.join(housing_path, "housing.csv")
return
pd.read_csv(csv_path)
這個函式會回傳一個
pandas DataFrame
物件
，
裡面有所有的資料
。
快速地看一下資料結構
我們用
DataFrame
的
head()
方法來查看前五列
（
見圖
2-5）。
圖
2-5
資料組的前五列
每一列都代表一個地區
，
裡面有
10
個屬性
（
你可以在螢幕擷圖中看到前
6
個
）：
longitude, latitude ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.