fix scalers return data format

Author: risenW

danfojs/src/core/get_dummies.js

@@ -13,8 +13,8 @@ function oneHot(in_data, prefix, prefix_sep){
             return prefix + prefix_sep + x
         })
     }else{
-        prefix_labels = labels.map((x,i)=>{
-            return x+ prefix_sep + i
+        prefix_labels = labels.map((x)=>{
+            return x
         })
     }
 

danfojs/src/core/timeseries.js

@@ -300,7 +300,7 @@ export class TimeSeries {
 }
 
 
-export const to_date_time = (kwargs)=>{
+export const to_datetime = (kwargs)=>{
 
     let timeseries = new TimeSeries(kwargs); // parsed to date-time
     timeseries.preprocessed() // generate date-time list

danfojs/src/index.js

@@ -1,12 +1,12 @@
 // export { Series, DataFrame, to_date_time } from './core/index';
 export { Series } from './core/series';
 export { DataFrame } from './core/frame';
-export { to_date_time } from './core/timeseries';
+export { to_datetime } from './core/timeseries';
 export {read_csv} from './io/reader'
 // export {read_json} from './io/reader'
 export {merge} from './core/merge'
 export {concat} from './core/concat'
 export {LabelEncoder, OneHotEncoder} from './preprocessing/encodings' //TODO Create js file to expose functions
-export {RobustScaler, MinMaxScaler, StandardScaler} from './preprocessing/scalers'
+export {MinMaxScaler, StandardScaler} from './preprocessing/scalers'
 export {date_range} from './core/date_range'
 export {get_dummies} from './core/get_dummies'