In a Pipeline, you can access a specific part of the sequence using slicing notation, which allows you to extract a subset of the data. Here’s an example:
In this example, we define a Pipeline with two steps: the first step scales the data using StandardScaler, and the second step fits a linear regression model using LinearRegression.
To access the first step in the Pipeline, we use slicing notation with a stop value of 1 ([:1]). This returns a new Pipeline with only the first step.
To access the second step in the Pipeline, we use slicing notation with a start value of 1 and a stop value of 2 ([1:2]). This returns a new Pipeline with only the second step.
Another Example
Here is another example of accessing different parts of a Pipeline using slicing:
In this example, we define a Pipeline with three steps: the first step imputes missing values using SimpleImputer, the second step scales the data using StandardScaler, and the third step fits a logistic regression model using LogisticRegression.
To access the first two steps in the Pipeline, we use slicing notation with a stop value of 2 ([:2]). This returns a new Pipeline with the first two steps.
To access the last step in the Pipeline, we use slicing notation with a negative index and a slice of length 1 ([-1:]). This returns a new Pipeline with only the last step.
To access the middle step in the Pipeline, we use slicing notation with a start value of 1 and a stop value of 2 ([1:2]). This returns a new Pipeline with only the second step.
Note that the result of slicing a Pipeline is another Pipeline, so you can continue to use the Pipeline API to interact with the sliced subset of the Pipeline.