Label Encoding

Question: Label Encoding is the method of converting label (categorical) data to numeric data via enumeration. We do this by enumerating the labels, replacing them with numbers starting from 0. Define a function 'lblenc' that takes in a table and symbol column name, and returns the table with the column converted to an integer list (type 7h). The function should encode all symbols as integers, and encoding should start at 0.

More Information:

https://www.geeksforgeeks.org/ml-label-encoding-of-datasets-in-python/

Example

                                
                                q)show shirts:([]sku:0 0 0 0 1 1;size:`s`s`s`s`l`xl;color:`red`blue`yellow`green`white`black;price:29.95 29.95 29.95 29.95 14.99 14.99) 
sku size color  price 
--------------------- 
0   s    red    29.95 
0   s    blue   29.95 
0   s    yellow 29.95 
0   s    green  29.95 
1   l    white  14.99 
1   xl   black  14.99 
q)lblenc[shirts;`size] // encode one feature 
sku size color  price 
--------------------- 
0   0    red    29.95 
0   0    blue   29.95 
0   0    yellow 29.95 
0   0    green  29.95 
1   1    white  14.99 
1   2    black  14.99 
q)lblenc/[shirts;`size`color] // encode multiple features 
sku size color price 
-------------------- 
0   0    0     29.95 
0   0    1     29.95 
0   0    2     29.95 
0   0    3     29.95 
1   1    4     14.99 
1   2    5     14.99
                                
                            

Solution

Tags:
functions machine learning
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algorithms api architecture c csv data structures dictionaries disk feedhandler finance functions ingestion ipc iterators machine learning math multithreading optimizations realtime shared library sql statistics streaming strings tables temporal websockets

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