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Pandas:十种数据处理技巧,让你事半功倍

本文所整理的技巧与以前整理过10个Pandas的常用技巧不同,你可能并不会经常的使用它,但是有时候当你遇到一些非常棘手的问题时,这些技巧可以帮你快速解决一些不常见的问题。1、Categorical类型默认情况下,具有有限数量选项的列都会被分配object类型。但是就内存来说并不是一个有效的选择。我们可以这些列建立索引,并仅使用对对象的引用而实际值。Pandas提供了一种称为Categorical的Dtype来解决这个问题。例如一个带有图片路径的大型数据集组成。每行有三列:anchor,pos

本文目录

    本文所整理的技巧与以前整理过10个Pandas的常用技巧不同,你可能并不会经常的使用它,但是有时候当你遇到一些非常棘手的问题时,这些技巧可以帮你快速解决一些不常见的问题。

    Pandas:十种数据处理技巧,让你事半功倍

    1、Categorical类型

    默认情况下,具有有限数量选项的列都会被分配object 类型。 但是就内存来说并不是一个有效的选择。 我们可以这些列建立索引,并仅使用对对象的引用而实际值。Pandas 提供了一种称为 Categorical的Dtype来解决这个问题。

    例如一个带有图片路径的大型数据集组成。 每行有三列:anchor, positive, and negative.。

    如果类别列使用 Categorical 可以显着减少内存使用量。

    # raw data
     +----------+------------------------+
     |class |filename|
     +----------+------------------------+
     | Bathroom | Bathroombath_1.jpg|
     | Bathroom | Bathroombath_100.jpg|
     | Bathroom | Bathroombath_1003.jpg |
     | Bathroom | Bathroombath_1004.jpg |
     | Bathroom | Bathroombath_1005.jpg |
     +----------+------------------------+
     
     # target
     +------------------------+------------------------+----------------------------+
     | anchor |positive|negative|
     +------------------------+------------------------+----------------------------+
     | Bathroombath_1.jpg| Bathroombath_100.jpg| Dinningdin_540.jpg|
     | Bathroombath_100.jpg| Bathroombath_1003.jpg | Dinningdin_1593.jpg |
     | Bathroombath_1003.jpg | Bathroombath_1004.jpg | Bedroombed_329.jpg|
     | Bathroombath_1004.jpg | Bathroombath_1005.jpg | Livingroomliving_1030.jpg |
     | Bathroombath_1005.jpg | Bathroombath_1007.jpg | Bedroombed_1240.jpg |
     +------------------------+------------------------+----------------------------+

    filename列的值会经常被复制重复。因此,所以通过使用Categorical可以极大的减少内存使用量。

    让我们读取目标数据集,看看内存的差异:

    triplets.info(memory_usage="deep")
     
     # Column Non-Null Count Dtype
     # --- ------ -------------- -----
     # 0 anchor 525000 non-null category
     # 1 positive 525000 non-null category
     # 2 negative 525000 non-null category
     # dtypes: category(3)
     # memory usage: 4.6 MB
     
     # without categories
     triplets_raw.info(memory_usage="deep")
     
     # Column Non-Null Count Dtype
     # --- ------ -------------- -----
     # 0 anchor 525000 non-null object
     # 1 positive 525000 non-null object
     # 2 negative 525000 non-null object
     # dtypes: object(3)
     # memory usage: 118.1 MB

    差异非常大,并且随着重复次数的增加,差异呈非线性增长。

    2、行列转换

    sql中经常会遇到行列转换的问题,Pandas有时候也需要,让我们看看来自Kaggle比赛的数据集。census_start .csv文件:

    Pandas:十种数据处理技巧,让你事半功倍

    可以看到,这些按年来保存的,如果有一个列year和pct_bb,并且每一行有相应的值,则会好得多,对吧。

    cols = sorted([col for col in original_df.columns 
     if col.startswith("pct_bb")])
     df = original_df[(["cfips"] + cols)]
     df = df.melt(id_vars="cfips",
    value_vars=cols,
    var_name="year",
    value_name="feature").sort_values(by=["cfips", "year"])

    看看结果,这样是不是就好很多了:

    Pandas:十种数据处理技巧,让你事半功倍

    3、apply()很慢

    我们上次已经介绍过,最好不要使用这个方法,因为它遍历每行并调用指定的方法。但是要是我们没有别的选择,那还有没有办法提高速度呢?

    可以使用swifter或pandarallew这样的包,使过程并行化。

    Swifter

    import pandas as pd
     import swifter
     
     def target_function(row):
     return row * 10
     
     def traditional_way(data):
     data['out'] = data['in'].apply(target_function)
     
     def swifter_way(data):
     data['out'] = data['in'].swifter.apply(target_function)

    Pandarallel

    import pandas as pd
     from pandarallel import pandarallel
     
     def target_function(row):
     return row * 10
     
     def traditional_way(data):
     data['out'] = data['in'].apply(target_function)
     
     def pandarallel_way(data):
     pandarallel.initialize()
     data['out'] = data['in'].parallel_apply(target_function)

    通过多线程,可以提高计算的速度,当然当然,如果有集群,那么最好使用dask或pyspark

    4、空值,int, Int64

    标准整型数据类型不支持空值,所以会自动转换为浮点数。所以如果数据要求在整数字段中使用空值,请考虑使用Int64数据类型,因为它会使用pandas.NA来表示空值。

    5、Csv, 压缩还是parquet?

    尽可能选择parquet。parquet会保留数据类型,在读取数据时就不需要指定dtypes。parquet文件默认已经使用了snappy进行压缩,所以占用的磁盘空间小。下面可以看看几个的对比

    |file|size |
     +------------------------+---------+
     | triplets_525k.csv| 38.4 MB |
     | triplets_525k.csv.gzip |4.3 MB |
     | triplets_525k.csv.zip|4.5 MB |
     | triplets_525k.parquet|1.9 MB |
     +------------------------+---------+

    读取parquet需要额外的包,比如pyarrow或fastparquet。chatgpt说pyarrow比fastparquet要快,但是我在小数据集上测试时fastparquet比pyarrow要快,但是这里建议使用pyarrow,因为pandas 2.0也是默认的使用这个。

    6、value_counts ()

    计算相对频率,包括获得绝对值、计数和除以总数是很复杂的,但是使用value_counts,可以更容易地完成这项任务,并且该方法提供了包含或排除空值的选项。

    df = pd.DataFrame({"a": [1, 2, None], "b": [4., 5.1, 14.02]})
     df["a"] = df["a"].astype("Int64")
     print(df.info())
     print(df["a"].value_counts(normalize=True, dropna=False),
    df["a"].value_counts(normalize=True, dropna=True), sep="nn")

    Pandas:十种数据处理技巧,让你事半功倍

    这样是不是就简单很多了

    7、Modin

    注意:Modin现在还在测试阶段。

    pandas是单线程的,但Modin可以通过缩放pandas来加快工作流程,它在较大的数据集上工作得特别好,因为在这些数据集上,pandas会变得非常缓慢或内存占用过大导致OOM。

    !pip install modin[all]
     
     import modin.pandas as pd
     df = pd.read_csv("my_dataset.csv")

    以下是modin官网的架构图,有兴趣的研究把:

    Pandas:十种数据处理技巧,让你事半功倍

    8、extract()

    如果经常遇到复杂的半结构化的数据,并且需要从中分离出单独的列,那么可以使用这个方法:

    import pandas as pd
     
     regex = (r'(?P[A-Za-z's]+),'
    r'(?P<author>[A-Za-zs']+),'
    r'(?P<isbn>[d-]+),'
    r'(?P<year>d{4}),'
    r'(?P<publisher>.+)')
     addr = pd.Series([
     "The Lost City of Amara,Olivia Garcia,978-1-234567-89-0,2023,HarperCollins",
     "The Alchemist's Daughter,Maxwell Greene,978-0-987654-32-1,2022,Penguin Random House",
     "The Last Voyage of the HMS Endeavour,Jessica Kim,978-5-432109-87-6,2021,Simon & Schuster",
     "The Ghosts of Summer House,Isabella Lee,978-3-456789-12-3,2000,Macmillan Publishers",
     "The Secret of the Blackthorn Manor,Emma Chen,978-9-876543-21-0,2023,Random House Children's Books"
    ])
     addr.str.extract(regex)</pre><p style="text-align: center;" ><p ><img src="https://img.zhengruan.com/uploads/20230427/168257617390983.png" alt="Pandas:十种数据处理技巧,让你事半功倍" /></p></p><h4 style="line-height: 1;"  >9、读写剪贴板</h4><p >这个技巧有人一次也用不到,但是有人可能就是需要,比如:在分析中包含PDF文件中的表格时。通常的方法是复制数据,粘贴到Excel中,导出到csv文件中,然后导入Pandas。但是,这里有一个更简单的解决方案:pd.read_clipboard()。我们所需要做的就是复制所需的数据并执行一个方法。</p><p >有读就可以写,所以还可以使用to_clipboard()方法导出到剪贴板。</p><p >但是要记住,这里的剪贴板是你运行python/jupyter主机的剪切板,并不可能跨主机粘贴,一定不要搞混了。</p><h4 style="line-height: 1;"  >10、数组列分成多列</h4><p >假设我们有这样一个数据集,这是一个相当典型的情况:</p><pre class="brush:javascript;toolbar:false;">import pandas as pd
     df = pd.DataFrame({"a": [1, 2, 3],
    "b": [4, 5, 6],
    "category": [["foo", "bar"], ["foo"], ["qux"]]})
     
     # let's increase the number of rows in a dataframe
     df = pd.concat([df]*10000, ignore_index=True)</pre><p style="text-align: center;" ><p ><img src="https://img.zhengruan.com/uploads/20230427/168257617378759.png" alt="Pandas:十种数据处理技巧,让你事半功倍" /></p></p><p >我们想将category分成多列显示,例如下面的</p><p style="text-align: center;" ><p ><img src="https://img.zhengruan.com/uploads/20230427/168257617465287.png" alt="Pandas:十种数据处理技巧,让你事半功倍" /></p></p><p >先看看最慢的apply:</p><pre class="brush:javascript;toolbar:false;">def dummies_series_apply(df):
    return df.join(df['category'].apply(pd.Series) 
    .stack() 
    .str.get_dummies() 
    .groupby(level=0) 
    .sum()) 
    .drop("category", axis=1)
     %timeit dummies_series_apply(df.copy())
     #5.96 s ± 66.6 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)</pre><p >sklearn的MultiLabelBinarizer</p><pre class="brush:javascript;toolbar:false;">from sklearn.preprocessing import MultiLabelBinarizer
     def sklearn_mlb(df):
    mlb = MultiLabelBinarizer()
    return df.join(pd.DataFrame(mlb.fit_transform(df['category']), columns=mlb.classes_)) 
    .drop("category", axis=1)
     %timeit sklearn_mlb(df.copy())
     #35.1 ms ± 1.31 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)</pre><p >是不是快了很多,我们还可以使用一般的向量化操作对其求和:</p><pre class="brush:plain;toolbar:false;">def dummies_vectorized(df):
    return pd.get_dummies(df.explode("category"), prefix="cat") 
    .groupby(["a", "b"]) 
    .sum() 
    .reset_index()
     %timeit dummies_vectorized(df.copy())
     #29.3 ms ± 1.22 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)</pre><p style="text-align: center;" ><p ><img src="https://img.zhengruan.com/uploads/20230427/168257617419157.png" alt="Pandas:十种数据处理技巧,让你事半功倍" /></p></p><p >使用第一个方法(在StackOverflow上的回答中非常常见)会给出一个非常慢的结果。而其他两个优化的方法的时间是非常快速的。</p><h4 style="line-height: 1;"  >总结</h4><p >我希望每个人都能从这些技巧中学到一些新的东西。重要的是要记住尽可能使用向量化操作而不是apply()。此外,除了csv之外,还有其他有趣的存储数据集的方法。不要忘记使用分类数据类型,它可以节省大量内存。感谢阅读!</p>                         </div>
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