featuretools.primitives.Diff

class featuretools.primitives.Diff(periods=0)

Computes the difference between the value in a list and the previous value in that list.

Parameters:

periods (int) – The number of periods by which to shift the index row. Default is 0. Periods correspond to rows.

Description:

Given a list of values, compute the difference from the previous item in the list. The result for the first element of the list will always be NaN.

Examples

>>> diff = Diff()
>>> values = [1, 10, 3, 4, 15]
>>> diff(values).tolist()
[nan, 9.0, -7.0, 1.0, 11.0]

You can specify the number of periods to shift the values

>>> values = [1, 2, 4, 7, 11, 16]
>>> diff_periods = Diff(periods = 1)
>>> diff_periods(values).tolist()
[nan, nan, 1.0, 2.0, 3.0, 4.0]

__init__(periods=0)

Methods

__init__([periods])
flatten_nested_input_types(input_types)	Flattens nested column schema inputs into a single list.
generate_name(base_feature_names)
generate_names(base_feature_names)
get_args_string()
get_arguments()
get_description(input_column_descriptions[, ...])
get_filepath(filename)
get_function()

Attributes

base_of
base_of_exclude
commutative
default_value	Default value this feature returns if no data found.
description_template
input_types	woodwork.ColumnSchema types of inputs
max_stack_depth
name	Name of the primitive
number_output_features	Number of columns in feature matrix associated with this feature
return_type	ColumnSchema type of return
stack_on
stack_on_exclude
stack_on_self
uses_calc_time
uses_full_dataframe