slice
Extract a range/slice of elements from a column of texts or lists.
Using
start, stop and step to define a range of indices, the corresponding range of elements is extracted
from each text or list in the input column.
Note: indices start at 0, and a stop of 3 means elements up to but not including the element at index 3
will be extracted. In particular this means simply specifying "stop": 3 (setting or leaving start at its
default of 0), will extract 3 elements in total.
Usage
The following shows how the step can be used in a recipe.Examples
Examples
General syntax for using the step in a recipe. Shows the inputs and outputs the step is expected to receive and will produce respectively. For futher details see sections below.
Inputs & Outputs
The following are the inputs expected by the step and the outputs it produces. These are generally columns (ds.first_name), datasets (ds or ds[["first_name", "last_name"]]) or models (referenced
by name e.g. "churn-clf").
Inputs
Inputs
A column containing texts or lists to extract a range of characters or elements from.
Outputs
Outputs
Contains the extracted slices. The type depends on the
out_type parameter, and needs to be consistent with the transformation.Configuration
The following parameters can be used to configure the behaviour of the step by including them in a json object as the last “input” to the step, i.e.step(..., {"param": "value", ...}) -> (output).
Parameters
Parameters
Index of the first element to be extracted from each string or list in the input column.
Index at which to stop including elements from the list.
The element at the
stop index will not be included. As an example, "start": 0, "stop": 3
will include all elements up to but not including the element at index 3, thus extracting a
total of 3 elements.Step size used to move from
start to stop index.
E.g., if "step": 2, only every second element from the range [start, stop] is returned.Select types using their name.Values must be one of the following:
category date number boolean url sex text list[number] list[category] list[url] list[boolean] list[date]