EvalPrediction是一个具有 predictions字段和 label_ids 字段的元组。 返回一个字典,键值对是key:metric 名字(string类型),value:metric 值(float类型)。 也就是教程4.1说的:直接调用metric的compute方法,传入labels和predictions即可得到metric的值。也只有这样做才能在训练时得到acc、F1等结果(具体指标根据不同任务来定...
在上述代码中,使用paste0()函数将col_name变量的值与其他字符串拼接在一起,创建一个新的列名为"new_column",并将some_expression的结果赋值给该列。 需要注意的是,transform()函数会创建一个新的数据框,而不会修改原始数据框。因此,需要将结果赋值给一个新的变量或覆盖原始数据框。 在云计算领域中,R语言的tran...
You can also add custom transformations using PySpark, Python (User-Defined Function), pandas, and PySpark SQL. Some transforms operate in place, while others create a new output column in your dataset. You can apply transforms to multiple columns at once. For example, you can delete multiple...
Thecategoricaltransform passes through a data set, operating on text columns, to build a dictionary of categories. For each row, the entire text string appearing in the input column is defined as a category. The output of the categorical transform is an indicator vector. Each slot in this vec...
{0 or ‘index’, 1 or ‘columns’}, default 0 If 0 or ‘index’: apply function to each column. If 1 or ‘columns’: apply function to each row.
Copy and paste the following code into an empty notebook cell. This code uses the Apache SparkselectExpr()method and the SQLupperexpression to convert a string column to upper case (and rename the column). display(df.selectExpr("Count","upper(County) as big_name")) ...
This code uses the Apache Spark selectExpr() method and the SQL upper expression to convert a string column to upper case (and rename the column). Python Scala R Copy display(df.selectExpr("Count", "upper(County) as big_name")) Press Shift+Enter to run the cell and then move to ...
Function to usefortransforming the data. If a function, must either work when passed a Seriesorwhen passed to Series.apply. Accepted combinations are: function string function name list of functionsand/orfunction names, e.g. [np.exp.'sqrt'] ...
s row names will be dropped. If a character string, an additional variable of that name will be added to the data set containing the data frame’s row names. If a data.frame is being returned, a variable with the name row_variable_name will be removed as a column from the data ...
Copy and paste the following code into an empty notebook cell. This code imports theexpr()function and then uses theApache Sparkexpr()function and the SQLlowerexpression to convert a string column to lower case (and rename the column). ...