This topic describes how to use a PyODPS node to sample data.

Prerequisites

The following operations are completed:

Procedure

  1. Prepare test data.
    1. Download the iris dataset named iris.data and rename it iris.csv.
    2. Create a table named pyodps_iris and import the data in the iris.csv dataset to the table. For more information, see Create tables and import data.
      In this example, execute the following statement to create the pyodps_iris table:
      CREATE TABLE if not exists pyodps_iris
      (
      sepallength  DOUBLE comment 'sepal length (cm)',
      sepalwidth   DOUBLE comment 'sepal width (cm)',
      petallength  DOUBLE comment 'petal length (cm)',
      petalwidth   DOUBLE comment 'petal width (cm)',
      name         STRING comment 'type'
      );
  2. Log on to the DataWorks console.
  3. In the left-side navigation pane, click Workspaces.
  4. On the Workspaces page, find the target workspace and click Data Analytics in the Actions column.
  5. On the Data Development tab, right-click the target workflow in the Business process section and choose New > MaxCompute > PyODPS 2.
  6. In the New node dialog box, set the Node name parameter and click Submit.
  7. On the configuration tab of the PyODPS node, enter the code of the node in the code editor.
    In this example, enter the following code:
    # Sample data.
    from  odps.df import DataFrame
    iris = DataFrame(o.get_table('pyodps_iris'))
    # Sample data by part.
    print iris.sample(parts=10).head(5) # Divide the target data into 10 parts. Part 0 is obtained by default.
    print iris.sample(parts=10,i=0).head(5) # Divide the target data into 10 parts and obtain part 0.
    print iris.sample(parts=10,i=[2,5]).head(5)  # Divide the target data into 10 parts and obtain part 2 and part 5.
    print iris.sample(parts=10,columns=['name','sepalwidth']).head(5) # Divide the target data into 10 parts and sample data based on the values of name and sepalwidth.
    
    # Sample data based on the specified number of data records or proportion.
    print iris.sample(n=100).head()  # Obtain 100 data records.
    
    print iris.sample(frac=0.3).head() # Obtain 30% of the target data.
    
    # Sample data based on the weight column.
    print iris.sample(n=100,weights='sepallength').head()
    
    print iris.sample(n=100,weights='sepalwidth',replace=True).head()
    
    # Perform stratified sampling.
    print iris.sample(strata='name',n={'Iris-setosa' : 10,'Iris-versicolor' : 10}).head()
    print iris.sample(strata='name',frac={'Iris-setosa': 0.5,'Iris-versicolor': 0.4}).head()
  8. Click the Run icon in the toolbar.Run node.png
  9. View the running result of the PyODPS 2 node on the Run Log tab.
    In this example, the following information appears on the Run Log tab:
    Collection: ref_0
      odps.Table
        name: WB_BestPractice_dev.`pyodps_iris`
        schema:
          sepallength           : double      # Sepal length (cm)
          sepalwidth            : double      # Sepal width (cm)
          petallength           : double      # Petal length (cm)
          petalwidth            : double      # Petal width (cm)
          name                  : string      # Type
    Sample[collection]
      _input:
      _parts:
        Scalar[int8]
          10
      _i:
      _replace:
        Scalar[boolean]
          False
    Collection: ref_0
      odps.Table
        name: WB_BestPractice_dev.`pyodps_iris`
        schema:
          sepallength           : double      # Sepal length (cm)
          sepalwidth            : double      # Sepal width (cm)
          petallength           : double      # Petal length (cm)
          petalwidth            : double      # Petal width (cm)
          name                  : string      # Type
    Sample[collection]
      _input:
      _parts:
        Scalar[int8]
          10
      _i:
      _replace:
        Scalar[boolean]
          False
    Collection: ref_0
      odps.Table
        name: WB_BestPractice_dev.`pyodps_iris`
        schema:
          sepallength           : double      # Sepal length (cm)
          sepalwidth            : double      # Sepal width (cm)
          petallength           : double      # Petal length (cm)
          petalwidth            : double      # Petal width (cm)
          name                  : string      # Type
    Sample[collection]
      _input:
      _parts:
        Scalar[int8]
          10
      _i:
      _replace:
        Scalar[boolean]
          False
    Collection: ref_0
      odps.Table
        name: WB_BestPractice_dev.`pyodps_iris`
        schema:
          sepallength           : double      # Sepal length (cm)
          sepalwidth            : double      # Sepal width (cm)
          petallength           : double      # Petal length (cm)
          petalwidth            : double      # Petal width (cm)
          name                  : string      # Type
    Sample[collection]
      _input:
      _parts:
        Scalar[int8]
          10
      _i:
      _sampled_fields:
        name = Column[sequence(string)] 'name' from collection ref_0
        sepalwidth = Column[sequence(float64)] 'sepalwidth' from collection ref_0
      _replace:
        Scalar[boolean]
          False
    Executing RandomSample...
    Command: PAI -name RandomSample -project algo_public -Dreplace="false" -Dlifecycle="1" -DoutputTableName="tmp_pyodps_1570690014_69f3d75d_9537_4c9c_87ea_a5f6ad8d2e07" -DsampleSize="100" -DinputTableName="WB_BestPractice_dev.pyodps_iris";
    Instance ID: 20191010064654985g6co9592
    
    Sub Instance: create_output (20191010064700688g5cbn62m_71ee0561_bcc4_4147_b849_f74688353fb6)
    
    Sub Instance: without_replacement (20191010064703694g9cbn62m_93a8a15b_ffd1_4afe_8928_19f28455a15c)
    
    
    Try to fetch data from tunnel
    
        sepallength  sepalwidth  petallength  petalwidth            name
    0           5.1         3.5          1.4         0.2     Iris-setosa
    1           4.9         3.0          1.4         0.2     Iris-setosa
    2           4.7         3.2          1.3         0.2     Iris-setosa
    3           4.6         3.1          1.5         0.2     Iris-setosa
    4           5.0         3.6          1.4         0.2     Iris-setosa
    5           4.6         3.4          1.4         0.3     Iris-setosa
    6           4.4         2.9          1.4         0.2     Iris-setosa
    7           4.9         3.1          1.5         0.1     Iris-setosa
    8           4.8         3.4          1.6         0.2     Iris-setosa
    9           4.8         3.0          1.4         0.1     Iris-setosa
    10          4.3         3.0          1.1         0.1     Iris-setosa
    11          5.1         3.5          1.4         0.3     Iris-setosa
    12          5.7         3.8          1.7         0.3     Iris-setosa
    13          5.1         3.8          1.5         0.3     Iris-setosa
    14          5.1         3.7          1.5         0.4     Iris-setosa
    15          4.6         3.6          1.0         0.2     Iris-setosa
    16          5.1         3.3          1.7         0.5     Iris-setosa
    17          4.8         3.4          1.9         0.2     Iris-setosa
    18          5.0         3.4          1.6         0.4     Iris-setosa
    19          5.2         3.5          1.5         0.2     Iris-setosa
    20          5.2         3.4          1.4         0.2     Iris-setosa
    21          4.8         3.1          1.6         0.2     Iris-setosa
    22          5.2         4.1          1.5         0.1     Iris-setosa
    23          5.5         4.2          1.4         0.2     Iris-setosa
    24          4.9         3.1          1.5         0.1     Iris-setosa
    25          5.0         3.2          1.2         0.2     Iris-setosa
    26          4.4         3.0          1.3         0.2     Iris-setosa
    27          5.1         3.4          1.5         0.2     Iris-setosa
    28          5.0         3.5          1.3         0.3     Iris-setosa
    29          4.5         2.3          1.3         0.3     Iris-setosa
    ..          ...         ...          ...         ...             ...
    70          7.1         3.0          5.9         2.1  Iris-virginica
    71          7.6         3.0          6.6         2.1  Iris-virginica
    72          7.3         2.9          6.3         1.8  Iris-virginica
    73          7.2         3.6          6.1         2.5  Iris-virginica
    74          6.5         3.2          5.1         2.0  Iris-virginica
    75          6.8         3.0          5.5         2.1  Iris-virginica
    76          5.8         2.8          5.1         2.4  Iris-virginica
    77          7.7         3.8          6.7         2.2  Iris-virginica
    78          7.7         2.6          6.9         2.3  Iris-virginica
    79          7.7         2.8          6.7         2.0  Iris-virginica
    80          6.3         2.7          4.9         1.8  Iris-virginica
    81          6.7         3.3          5.7         2.1  Iris-virginica
    82          6.2         2.8          4.8         1.8  Iris-virginica
    83          6.1         3.0          4.9         1.8  Iris-virginica
    84          6.4         2.8          5.6         2.1  Iris-virginica
    85          7.2         3.0          5.8         1.6  Iris-virginica
    86          7.4         2.8          6.1         1.9  Iris-virginica
    87          7.9         3.8          6.4         2.0  Iris-virginica
    88          6.3         2.8          5.1         1.5  Iris-virginica
    89          6.3         3.4          5.6         2.4  Iris-virginica
    90          6.4         3.1          5.5         1.8  Iris-virginica
    91          6.0         3.0          4.8         1.8  Iris-virginica
    92          6.9         3.1          5.4         2.1  Iris-virginica
    93          6.9         3.1          5.1         2.3  Iris-virginica
    94          5.8         2.7          5.1         1.9  Iris-virginica
    95          6.8         3.2          5.9         2.3  Iris-virginica
    96          6.7         3.3          5.7         2.5  Iris-virginica
    97          6.3         2.5          5.0         1.9  Iris-virginica
    98          6.2         3.4          5.4         2.3  Iris-virginica
    99          5.9         3.0          5.1         1.8  Iris-virginica
    [100 rows x 5 columns]
    Executing RandomSample...
    Command: PAI -name RandomSample -project algo_public -Dreplace="false" -DsampleRatio="0.3" -DoutputTableName="tmp_pyodps_1570690039_e1867332_72ea_4656_928d_3bd6e31d87c7" -Dlifecycle="1" -DinputTableName="WB_BestPractice_dev.pyodps_iris";
    Instance ID: 20191010064720117gmpms38
    
    Sub Instance: create_output (20191010064725740grcbn62m_b338a671_6047_4360_8792_41d2e748e41f)
    
    Sub Instance: without_replacement (20191010064728747gtcbn62m_6c9914da_d5c3_4336_b076_163edb1bf48a)
    
    Try to fetch data from tunnel
        sepallength  sepalwidth  petallength  petalwidth             name
    0           5.1         3.5          1.4         0.2      Iris-setosa
    1           4.7         3.2          1.3         0.2      Iris-setosa
    2           4.6         3.1          1.5         0.2      Iris-setosa
    3           4.8         3.4          1.6         0.2      Iris-setosa
    4           5.7         4.4          1.5         0.4      Iris-setosa
    5           5.1         3.5          1.4         0.3      Iris-setosa
    6           5.0         3.4          1.6         0.4      Iris-setosa
    7           5.2         3.4          1.4         0.2      Iris-setosa
    8           4.9         3.1          1.5         0.1      Iris-setosa
    9           5.5         3.5          1.3         0.2      Iris-setosa
    10          4.4         3.2          1.3         0.2      Iris-setosa
    11          5.0         3.3          1.4         0.2      Iris-setosa
    12          5.7         2.8          4.5         1.3  Iris-versicolor
    13          5.2         2.7          3.9         1.4  Iris-versicolor
    14          5.0         2.0          3.5         1.0  Iris-versicolor
    15          5.6         2.9          3.6         1.3  Iris-versicolor
    16          5.8         2.7          4.1         1.0  Iris-versicolor
    17          6.1         2.8          4.0         1.3  Iris-versicolor
    18          6.6         3.0          4.4         1.4  Iris-versicolor
    19          6.8         2.8          4.8         1.4  Iris-versicolor
    20          6.0         2.9          4.5         1.5  Iris-versicolor
    21          5.4         3.0          4.5         1.5  Iris-versicolor
    22          5.7         2.9          4.2         1.3  Iris-versicolor
    23          5.7         2.8          4.1         1.3  Iris-versicolor
    24          6.3         2.9          5.6         1.8   Iris-virginica
    25          4.9         2.5          4.5         1.7   Iris-virginica
    26          6.7         2.5          5.8         1.8   Iris-virginica
    27          6.4         2.7          5.3         1.9   Iris-virginica
    28          6.8         3.0          5.5         2.1   Iris-virginica
    29          5.7         2.5          5.0         2.0   Iris-virginica
    30          5.8         2.8          5.1         2.4   Iris-virginica
    31          6.5         3.0          5.5         1.8   Iris-virginica
    32          6.0         2.2          5.0         1.5   Iris-virginica
    33          6.3         2.7          4.9         1.8   Iris-virginica
    34          7.2         3.2          6.0         1.8   Iris-virginica
    35          6.2         2.8          4.8         1.8   Iris-virginica
    36          6.1         3.0          4.9         1.8   Iris-virginica
    37          6.4         2.8          5.6         2.1   Iris-virginica
    38          7.2         3.0          5.8         1.6   Iris-virginica
    39          6.3         2.8          5.1         1.5   Iris-virginica
    40          6.4         3.1          5.5         1.8   Iris-virginica
    41          6.0         3.0          4.8         1.8   Iris-virginica
    42          6.8         3.2          5.9         2.3   Iris-virginica
    43          6.3         2.5          5.0         1.9   Iris-virginica
    44          6.2         3.4          5.4         2.3   Iris-virginica
    
    Executing WeightedSample...
    Command: PAI -name WeightedSample -project algo_public -DinputTableName="WB_BestPractice_dev.pyodps_iris" -DsampleSize="100" -DprobCol="sepallength" -Dreplace="false" -DoutputTableName="tmp_pyodps_1570690063_6a62857e_8f85_4ea7_99ef_08aa259546d4" -Dlifecycle="1";
    Instance ID: 20191010064743533gnpms38
    
    Sub Instance: create_output (20191010064748787gkdbn62m_8d47bfb7_e470_4cce_8b69_28811f190083)
    
    Sub Instance: without_replacement (20191010064751793gmdbn62m_230a1d26_5c2e_440e_a31d_fe9e63c6f906)
    
    Try to fetch data from tunnel
        sepallength  sepalwidth  petallength  petalwidth             name
    0           4.9         3.0          1.4         0.2      Iris-setosa
    1           4.7         3.2          1.3         0.2      Iris-setosa
    2           5.0         3.6          1.4         0.2      Iris-setosa
    3           5.4         3.9          1.7         0.4      Iris-setosa
    4           5.0         3.4          1.5         0.2      Iris-setosa
    5           4.4         2.9          1.4         0.2      Iris-setosa
    6           4.8         3.4          1.6         0.2      Iris-setosa
    7           4.8         3.0          1.4         0.1      Iris-setosa
    8           5.4         3.9          1.3         0.4      Iris-setosa
    9           5.1         3.5          1.4         0.3      Iris-setosa
    10          5.7         3.8          1.7         0.3      Iris-setosa
    11          4.6         3.6          1.0         0.2      Iris-setosa
    12          5.0         3.4          1.6         0.4      Iris-setosa
    13          5.2         3.5          1.5         0.2      Iris-setosa
    14          5.2         3.4          1.4         0.2      Iris-setosa
    15          4.7         3.2          1.6         0.2      Iris-setosa
    16          4.8         3.1          1.6         0.2      Iris-setosa
    17          5.5         4.2          1.4         0.2      Iris-setosa
    18          4.9         3.1          1.5         0.1      Iris-setosa
    19          5.0         3.2          1.2         0.2      Iris-setosa
    20          5.5         3.5          1.3         0.2      Iris-setosa
    21          4.9         3.1          1.5         0.1      Iris-setosa
    22          5.1         3.4          1.5         0.2      Iris-setosa
    23          4.5         2.3          1.3         0.3      Iris-setosa
    24          4.8         3.0          1.4         0.3      Iris-setosa
    25          5.1         3.8          1.6         0.2      Iris-setosa
    26          4.6         3.2          1.4         0.2      Iris-setosa
    27          5.3         3.7          1.5         0.2      Iris-setosa
    28          5.0         3.3          1.4         0.2      Iris-setosa
    29          7.0         3.2          4.7         1.4  Iris-versicolor
    ..          ...         ...          ...         ...              ...
    70          7.2         3.6          6.1         2.5   Iris-virginica
    71          6.4         2.7          5.3         1.9   Iris-virginica
    72          5.7         2.5          5.0         2.0   Iris-virginica
    73          5.8         2.8          5.1         2.4   Iris-virginica
    74          6.4         3.2          5.3         2.3   Iris-virginica
    75          7.7         3.8          6.7         2.2   Iris-virginica
    76          6.9         3.2          5.7         2.3   Iris-virginica
    77          5.6         2.8          4.9         2.0   Iris-virginica
    78          7.7         2.8          6.7         2.0   Iris-virginica
    79          6.3         2.7          4.9         1.8   Iris-virginica
    80          6.7         3.3          5.7         2.1   Iris-virginica
    81          7.2         3.2          6.0         1.8   Iris-virginica
    82          6.2         2.8          4.8         1.8   Iris-virginica
    83          6.1         3.0          4.9         1.8   Iris-virginica
    84          7.2         3.0          5.8         1.6   Iris-virginica
    85          7.9         3.8          6.4         2.0   Iris-virginica
    86          6.4         2.8          5.6         2.2   Iris-virginica
    87          6.3         2.8          5.1         1.5   Iris-virginica
    88          6.1         2.6          5.6         1.4   Iris-virginica
    89          6.3         3.4          5.6         2.4   Iris-virginica
    90          6.4         3.1          5.5         1.8   Iris-virginica
    91          6.0         3.0          4.8         1.8   Iris-virginica
    92          6.9         3.1          5.1         2.3   Iris-virginica
    93          5.8         2.7          5.1         1.9   Iris-virginica
    94          6.8         3.2          5.9         2.3   Iris-virginica
    95          6.7         3.3          5.7         2.5   Iris-virginica
    96          6.7         3.0          5.2         2.3   Iris-virginica
    97          6.5         3.0          5.2         2.0   Iris-virginica
    98          6.2         3.4          5.4         2.3   Iris-virginica
    99          5.9         3.0          5.1         1.8   Iris-virginica
    [100 rows x 5 columns]
    Executing WeightedSample...
    Command: PAI -name WeightedSample -project algo_public -DinputTableName="WB_BestPractice_dev.pyodps_iris" -DsampleSize="100" -DprobCol="sepalwidth" -Dreplace="true" -DoutputTableName="tmp_pyodps_1570690082_f55e899c_3cb4_4eeb_ade4_b8cb79e018dc" -Dlifecycle="1";
    Instance ID: 2019101006480392g9ers38
    
    Sub Instance: create_output (20191010064808827g9ebn62m_fb70c859_913a_4830_9248_8c8eaf134f1d)
    
    Sub Instance: with_replacement (20191010064811833gdebn62m_07544cc2_1d7d_4fa5_972d_196eb6b9f537)
    
    
        sepallength  sepalwidth  petallength  petalwidth             name
    0           5.1         3.5          1.4         0.2      Iris-setosa
    1           4.6         3.4          1.4         0.3      Iris-setosa
    2           5.0         3.4          1.5         0.2      Iris-setosa
    3           5.0         3.4          1.5         0.2      Iris-setosa
    4           4.4         2.9          1.4         0.2      Iris-setosa
    5           4.8         3.4          1.6         0.2      Iris-setosa
    6           5.8         4.0          1.2         0.2      Iris-setosa
    7           5.8         4.0          1.2         0.2      Iris-setosa
    8           5.1         3.5          1.4         0.3      Iris-setosa
    9           5.1         3.5          1.4         0.3      Iris-setosa
    10          5.1         3.5          1.4         0.3      Iris-setosa
    11          5.1         3.7          1.5         0.4      Iris-setosa
    12          4.6         3.6          1.0         0.2      Iris-setosa
    13          4.8         3.4          1.9         0.2      Iris-setosa
    14          5.0         3.0          1.6         0.2      Iris-setosa
    15          5.0         3.4          1.6         0.4      Iris-setosa
    16          5.2         3.4          1.4         0.2      Iris-setosa
    17          4.8         3.1          1.6         0.2      Iris-setosa
    18          4.8         3.1          1.6         0.2      Iris-setosa
    19          5.4         3.4          1.5         0.4      Iris-setosa
    20          5.4         3.4          1.5         0.4      Iris-setosa
    21          5.4         3.4          1.5         0.4      Iris-setosa
    22          5.2         4.1          1.5         0.1      Iris-setosa
    23          5.2         4.1          1.5         0.1      Iris-setosa
    24          5.5         4.2          1.4         0.2      Iris-setosa
    25          5.0         3.2          1.2         0.2      Iris-setosa
    26          4.9         3.1          1.5         0.1      Iris-setosa
    27          4.4         3.0          1.3         0.2      Iris-setosa
    28          5.1         3.4          1.5         0.2      Iris-setosa
    29          5.0         3.5          1.3         0.3      Iris-setosa
    ..          ...         ...          ...         ...              ...
    70          5.6         2.7          4.2         1.3  Iris-versicolor
    71          5.7         2.9          4.2         1.3  Iris-versicolor
    72          6.3         3.3          6.0         2.5   Iris-virginica
    73          7.1         3.0          5.9         2.1   Iris-virginica
    74          6.3         2.9          5.6         1.8   Iris-virginica
    75          7.3         2.9          6.3         1.8   Iris-virginica
    76          7.2         3.6          6.1         2.5   Iris-virginica
    77          6.4         2.7          5.3         1.9   Iris-virginica
    78          6.8         3.0          5.5         2.1   Iris-virginica
    79          6.8         3.0          5.5         2.1   Iris-virginica
    80          5.8         2.8          5.1         2.4   Iris-virginica
    81          6.2         2.8          4.8         1.8   Iris-virginica
    82          6.2         2.8          4.8         1.8   Iris-virginica
    83          6.1         3.0          4.9         1.8   Iris-virginica
    84          6.4         2.8          5.6         2.1   Iris-virginica
    85          7.2         3.0          5.8         1.6   Iris-virginica
    86          7.4         2.8          6.1         1.9   Iris-virginica
    87          7.4         2.8          6.1         1.9   Iris-virginica
    88          7.4         2.8          6.1         1.9   Iris-virginica
    89          6.4         3.1          5.5         1.8   Iris-virginica
    90          6.0         3.0          4.8         1.8   Iris-virginica
    91          6.9         3.1          5.4         2.1   Iris-virginica
    92          6.7         3.1          5.6         2.4   Iris-virginica
    93          6.7         3.1          5.6         2.4   Iris-virginica
    94          6.7         3.1          5.6         2.4   Iris-virginica
    95          6.9         3.1          5.1         2.3   Iris-virginica
    96          6.9         3.1          5.1         2.3   Iris-virginica
    97          6.7         3.0          5.2         2.3   Iris-virginica
    98          6.5         3.0          5.2         2.0   Iris-virginica
    99          5.9         3.0          5.1         1.8   Iris-virginica
    [100 rows x 5 columns]
    Executing StratifiedSample...
    Command: PAI -name StratifiedSample -project algo_public -Dlifecycle="1" -DoutputTableName="tmp_pyodps_1570690104_6cc52795_2a86_4634_a905_740b3a426d3f" -DsampleSize="Iris-setosa:10,Iris-versicolor:10" -DstrataColName="name" -DinputTableName="WB_BestPractice_dev.pyodps_iris";
    Instance ID: 20191010064824633gaco9592
    
    Sub Instance: create_output (20191010064829870g4fbn62m_dfa297c5_23b5_43f5_bb17_83ba8d263630)
    
    
    Sub Instance: stratified_sampling (20191010064831874g7fbn62m_fc9eddb7_42f1_49fe_8206_891ef451fb76)
    
    Try to fetch data from tunnel
        sepallength  sepalwidth  petallength  petalwidth             name
    0           5.4         3.9          1.7         0.4      Iris-setosa
    1           4.3         3.0          1.1         0.1      Iris-setosa
    2           5.4         3.9          1.3         0.4      Iris-setosa
    3           5.1         3.3          1.7         0.5      Iris-setosa
    4           4.7         3.2          1.6         0.2      Iris-setosa
    5           4.5         2.3          1.3         0.3      Iris-setosa
    6           5.0         3.5          1.6         0.6      Iris-setosa
    7           5.1         3.8          1.9         0.4      Iris-setosa
    8           4.8         3.0          1.4         0.3      Iris-setosa
    9           5.0         3.3          1.4         0.2      Iris-setosa
    10          7.0         3.2          4.7         1.4  Iris-versicolor
    11          5.5         2.3          4.0         1.3  Iris-versicolor
    12          6.5         2.8          4.6         1.5  Iris-versicolor
    13          5.6         3.0          4.5         1.5  Iris-versicolor
    14          5.7         2.6          3.5         1.0  Iris-versicolor
    15          5.5         2.4          3.7         1.0  Iris-versicolor
    16          5.0         2.3          3.3         1.0  Iris-versicolor
    17          5.6         2.7          4.2         1.3  Iris-versicolor
    18          5.7         3.0          4.2         1.2  Iris-versicolor
    19          5.1         2.5          3.0         1.1  Iris-versicolor
    Executing StratifiedSample...
    Command: PAI -name StratifiedSample -project algo_public -DsampleRatio="Iris-setosa:0.5,Iris-versicolor:0.4" -DoutputTableName="tmp_pyodps_1570690128_a68477cd_19e5_4fe0_bb39_4712f76dd967" -Dlifecycle="1" -DstrataColName="name" -DinputTableName="WB_BestPractice_dev.pyodps_iris";
    Instance ID: 20191010064848733gbers38
    
    Sub Instance: create_output (20191010064853918gwfbn62m_4eb22c22_7051_4372_8d13_05c5a417aa87)
    
    Sub Instance: stratified_sampling (20191010064855924g0gbn62m_b4242ac7_bd5a_47a8_a1f2_3367a6a101a7)
    
    Try to fetch data from tunnel
        sepallength  sepalwidth  petallength  petalwidth             name
    0           4.9         3.0          1.4         0.2      Iris-setosa
    1           4.7         3.2          1.3         0.2      Iris-setosa
    2           5.0         3.6          1.4         0.2      Iris-setosa
    3           5.4         3.9          1.7         0.4      Iris-setosa
    4           5.0         3.4          1.5         0.2      Iris-setosa
    5           5.4         3.7          1.5         0.2      Iris-setosa
    6           4.8         3.4          1.6         0.2      Iris-setosa
    7           4.8         3.0          1.4         0.1      Iris-setosa
    8           5.8         4.0          1.2         0.2      Iris-setosa
    9           5.4         3.4          1.7         0.2      Iris-setosa
    10          5.1         3.7          1.5         0.4      Iris-setosa
    11          4.8         3.4          1.9         0.2      Iris-setosa
    12          5.0         3.0          1.6         0.2      Iris-setosa
    13          5.0         3.4          1.6         0.4      Iris-setosa
    14          5.2         3.5          1.5         0.2      Iris-setosa
    15          5.2         3.4          1.4         0.2      Iris-setosa
    16          4.7         3.2          1.6         0.2      Iris-setosa
    17          5.2         4.1          1.5         0.1      Iris-setosa
    18          5.0         3.2          1.2         0.2      Iris-setosa
    19          5.1         3.4          1.5         0.2      Iris-setosa
    20          4.5         2.3          1.3         0.3      Iris-setosa
    21          5.0         3.5          1.6         0.6      Iris-setosa
    22          5.1         3.8          1.9         0.4      Iris-setosa
    23          5.1         3.8          1.6         0.2      Iris-setosa
    24          5.3         3.7          1.5         0.2      Iris-setosa
    25          7.0         3.2          4.7         1.4  Iris-versicolor
    26          6.4         3.2          4.5         1.5  Iris-versicolor
    27          6.9         3.1          4.9         1.5  Iris-versicolor
    28          6.5         2.8          4.6         1.5  Iris-versicolor
    29          5.7         2.8          4.5         1.3  Iris-versicolor
    30          6.6         2.9          4.6         1.3  Iris-versicolor
    31          5.6         2.9          3.6         1.3  Iris-versicolor
    32          5.6         3.0          4.5         1.5  Iris-versicolor
    33          5.6         2.5          3.9         1.1  Iris-versicolor
    34          6.1         2.8          4.7         1.2  Iris-versicolor
    35          6.8         2.8          4.8         1.4  Iris-versicolor
    36          5.5         2.4          3.8         1.1  Iris-versicolor
    37          5.5         2.4          3.7         1.0  Iris-versicolor
    38          6.0         2.7          5.1         1.6  Iris-versicolor
    39          5.6         3.0          4.1         1.3  Iris-versicolor
    40          5.5         2.6          4.4         1.2  Iris-versicolor
    41          6.1         3.0          4.6         1.4  Iris-versicolor
    42          5.7         3.0          4.2         1.2  Iris-versicolor
    43          5.7         2.9          4.2         1.3  Iris-versicolor
    44          6.2         2.9          4.3         1.3  Iris-versicolor