sbairishal / Instacart

2nd place solution

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Instacart Market Basket Analysis 2nd place solution

I made two models for predicting reorder & None. Following are the features I made.

Features

User feature

  • How often the user reordered items
  • Time between orders
  • Time of day the user visits
  • Whether the user ordered organic, gluten-free, or Asian items in the past
  • Features based on order sizes
  • How many of the user’s orders contained no previously purchased items

Item feature

  • How often the item is purchased
  • Position in the cart
  • How many users buy it as "one shot" item
  • Stats on the number of items that co-occur with this item
  • Stats on the order streak
  • Probability of being reordered within N orders
  • Distribution of the day of week it is ordered
  • Probability it is reordered after the first order
  • Statistics around the time between orders

User x Item feature

  • Number of orders in which the user purchases the item
  • Days since the user last purchased the item
  • Streak (number of orders in a row the user has purchased the item)
  • Position in the cart
  • Whether the user already ordered the item today
  • Co-occurrence statistics
  • Replacement items

datetime feature

  • Counts by day of week
  • Counts by hour

More detail, please refer to codes.

F1 maximization

Regarding F1 maximization, I hadn't read that paper until Faron had published the kernel. But I got high score because of my F1 maximization. Let me explain it. For maximizing F1, I generate y_true according to predicted prob. And check F1 from higher prob. For example, lets say we have ordered item and prob, like {A: 0.3, B:0.5, C:0.4}. Then generate y_true in many times. In my case, generated 9999 times. So now we have many of y_true, like [ [A,B],[B],[B,C],[C],[B],[None].....]. As I mentioned above, next thing we do is to check F1 from [B], [B,C], [B,C,A]. Then we can estimate F1 peak out, and stop calculation, and go next order. You may know, in this method, we don't need to check all pattern, like [A],[A,B],[A,B,C],[B]... I guess some might have figured out this method from my comment of "tips to go farther". However, this method is time consuming as well as depends on seed. So finally I used Faron's kernel. Fortunatelly or not, I got almost same result using Faron's kernel. Please refer to py_model/pyx_get_best_items.pyx

How to run

  • cd py_feature
  • python 901_run_feature.py
  • python 902_run_concat.py
  • cd ../py_model
  • python 999_run.py

Requirements

Around 300 GB RAM needed(sorry).

Python packages:

  • numpy==1.12.1
  • pandas==0.19.2
  • scipy==0.19.0
  • tqdm==4.11.2
  • xgboost==0.6

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2nd place solution


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