I got stuck trying to fetch the previous value based on a criteria

问题

I'm new to FeatureTools library, and I got stuck trying to create two types of features, both are related to fetching previous values. One is the previous value itself for 'QUANTIDADE', 'VALOR_TOTAL' and 'DATA_NOTA', and the other is the time since the previous observation (days) which has 'DATA_NOTA' as the date field.

I don't know if it is possible to do it with FeaturelTools. If someone can help me, I would appreciate it.

I have a dataframe (df) as folowing:

When I normalize the above df it takes the following basic schema:

As I said, I would like to fetch the previous values and time since the last observation for 'QUANTIDADE', 'VALOR_TOTAL' and 'DATA_NOTA', but when the combination of 'CODIGO_PRODUTO' and 'CODIGO_CLIENTE' matches.

回答1:

After did some research I discovered that what I needed could be done using groupby_trans_primitives as follow:

from featuretools.primitives import TimeSincePrevious
time_since_previous = TimeSincePrevious(unit = "days")

fm, features = ft.dfs(entityset=es, 
                      target_entity='recordings',
                      trans_primitives = [],
                      agg_primitives = [],
                      max_depth=2,
                      verbose=True,
                      groupby_trans_primitives=['Diff',time_since_previous])

But I realized that I would like to exclude other entities than recordings, and now I got stuck trying to exclude those entities!

I've tried:

from featuretools.primitives import TimeSincePrevious
time_since_previous = TimeSincePrevious(unit = "days")

fm, features = ft.dfs(entityset=es, 
                      target_entity='recordings',
                      trans_primitives = [],
                      agg_primitives = [],
                      max_depth=2,
                      verbose=True,
                      groupby_trans_primitives=['Diff',time_since_previous],
                      primitive_options={'time_since_previous':{'ignore_groupby_entities': ['vendedores','produtos','cliente']}})

But this code still creates unintended features on the "excluded" entities.

I would appreciate any attempt to help me! Thank you!

来源：https://stackoverflow.com/questions/58701802/i-got-stuck-trying-to-fetch-the-previous-value-based-on-a-criteria

标签

feature-extraction

featuretools