python - Sklearn preprocessing - PolynomialFeatures - How to keep column names/headers of the output array / dataframe -

-

tldr: how headers output numpy array sklearn.preprocessing.polynomialfeatures() function?

let's have following code...

import pandas pd import numpy np sklearn import preprocessing pp  = np.ones(3) b = np.ones(3) * 2 c = np.ones(3) * 3  input_df = pd.dataframe([a,b,c]) input_df = input_df.t input_df.columns=['a', 'b', 'c']  input_df        b   c 0   1   2   3 1   1   2   3 2   1   2   3  poly = pp.polynomialfeatures(2) output_nparray = poly.fit_transform(input_df) print output_nparray  [[ 1.  1.  2.  3.  1.  2.  3.  4.  6.  9.]  [ 1.  1.  2.  3.  1.  2.  3.  4.  6.  9.]  [ 1.  1.  2.  3.  1.  2.  3.  4.  6.  9.]]

how can 3x10 matrix/ output_nparray carry on a,b,c labels how relate data above?

working example, in 1 line (i assume "readability" not goal here):

target_feature_names = ['x'.join(['{}^{}'.format(pair[0],pair[1]) pair in tuple if pair[1]!=0]) tuple in [zip(input_df.columns,p) p in poly.powers_]] output_df = pd.dataframe(output_nparray, columns = target_feature_names)

Comments

Post a Comment

Popular posts from this blog

java - nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet Hibernate+SpringMVC -

-
i trying fetch records database , having above error this classs appropriate getters , setters public class user { private int id; private string username; private string password; private string email; i have create database , inserted data below configuration <bean id="datasource" class="org.apache.commons.dbcp2.basicdatasource" destroy-method="close"> <property name="driverclassname" value="com.mysql.jdbc.driver"/> <property name="url" value="jdbc:mysql://localhost:3306/usersdb"/> <property name="username" value="root"/> <property name="password" value=""/> </bean> this complete stacktrace severe: servlet.service() servlet [appservlet] in context path [/spring] threw exception [request processing failed; nested exception org.hibernate.exception.sqlgrammarexception: not ...
Read more

sql - Postgresql tables exists, but getting "relation does not exist" when querying -

-
Image
i have postgresql db number of tables. if query: select column_name information_schema.columns table_name="my_table"; i list of columns returned properly. however, when query: select * "my_table"; i error: (programmingerror) relation "my_table" not exist 'select *\n "my_table"\n' {} any thoughts on why can columns, can't query table? goal able query table. you have include schema if isnt public one select * <schema>."my_table" or can change default schema show search_path; set search_path my_schema; check table schema here select * information_schema.columns for example if table on default schema public both works ok select * parroquias_region select * public.parroquias_region but sectors need specify schema select * map_update.sectores_point
Read more

asp.net mvc - breakpoint on javascript in CSHTML? -

-
i have .cshtml file has javascript tag. within script tag have few lines of javascript. first line of javascript refers property in @viewbag. other javascript lines plain script without mvc related references. observation: can place breakpoints (visual studio 2015) on each of these javascript lines. however, breakpoints has white dot in center of breakpoint symbol (red circle) except line @viewbag reference (this particular line not have white dot in center). it seems breakpoint without white dot hit during run-time. question: can explain going on here? white dot mean? why plain red breakpoint line line hitting breakpoint? the visual studio debugger expecting debug actual server-side code within .cshtml file opposed client-side javascript within it. iirc, visual studio allow debug javascript code expected in internet explorer (and possibly edge), other browsers want use either third-party tool or developer tools (f12) within browser. an easy approach take advant...
Read more