The Nanotechnology in ecommerce Tao BDTC2014

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1 The Nanotechnology in ecommerce Tao BDTC2014

2 The Analogy Nanotechnology ( nanotech ) is the manipulation of matter on an atomic, molecular, and supramolecular scale. - Wikipedia Big Data in ecommerce is the management of business on an individual customer scale.

3 The Analogy Objective Nanotech in material science To be stronger, lighter, cheaper Big Data in ecommerce Smarter, better customer experience, less cost and more profit Scale Nanometers Individual customer, individual item Method Electronic microscope, Lithography Hadoop, hive Data mining, optimization

4 Agenda Chapter 1: Atom/molecular interacts with its neighbors, so does our product Bundle recommendation in ecommerce Chapter 2: Manipulate at nano scale Personalized recommendation at individual customer level Chapter 3: Environment/context matters O2O initiatives at Walmart: pickup in store, WMX, savings catcher and mobile

5 Agenda Chapter 1: Atom/molecular interacts with its neighbors, so does our product Bundle recommendation in ecommerce Chapter 2: Manipulate at nano scale Personalized recommendation at individual customer level Chapter 3: Environment/context matters O2O initiatives at Walmart: pickup in store, WMX, savings catcher and mobile

6 Ch1: Interactions with neighbors Bundle recommendation in ecommerce

7 Ch1: Interactions with neighbors Why consider bundles? How to construct bundles (technical) The Bundle Recommendation Problem (BRP) Solving BRP Offline and online experiments The baseline models Relative improvement over baseline models Sensitivity to candidate set size Sensitivity to parameter lambda Online test result

8 Ch1.1-Why consider bundles Customer buy bundles

9 Ch1.1-Why consider bundles Customer buy bundles Contextual influence

10 Ch1.1-Why consider bundles Customer buy bundles Contextual influencer Product compatibility or consistency

11 Ch1.1-Why consider bundles Customer buy bundles Contextual influencer Product compatibility or consistency Cost saving

12 Ch1.1-Why consider bundles A real life case study:

13 Ch1.2-The Bundle Recommendation Problem Let x i be the indicator decision variable where x i =1 denotes item I is chosen and x i =0 denotes notchosen Find x that maximizes the expected total reward rate

14 Ch1.2-The Bundle Recommendation Problem Approximate the objective with the first two terms, we arrive the Bundle Recommendation Problem (BRP) as follows However BRP is in general NP-hard n is usually on the order of 10 6 We want to solve it for every individual customer

15 Ch1.2-The Bundle Recommendation Problem

16 Ch1.3-Online experiment

17 Agenda Chapter 1: Atom/molecular interacts with its neighbors, so does our product Bundle recommendation in ecommerce Chapter 2: Manipulate at nano scale Personalized recommendation at individual customer level Chapter 3: Environment/context matters O2O initiatives at Walmart: pickup in store, WMX, savings catcher and mobile

18 Chapter 2: Personalized recommendations Walmart.com Transaction Data Click Stream Data (Omniture and Hubble) InStore Transaction Data Top K recommendations of products or categories Other Labs Feeds (social, pricing, costs, strongmail)

19 Ch2.1 Matrix Factorization Matrix Factorization or Mainly driven by Netflix Prize Competition (M ~ 500k X 17k) Solve: Algos: Grad descent, Stochastic grad descent, Alternating least squares, SVD (only for median scale problem)

20 Ch2.1 Matrix Factorization Reality and challenges at Walmart.com no ratings (but action-notaction behaviors, e.g., transactions) Way more users than items Existing algo s have a lot of randomness we have no control of; and the solution is local optimal How to incorporate signals from multiple domains? e.g., browsing behaviors, in-store behaviors, searched keywords, gender, age, geo, etc. Multi-source matrix factorization model Binary representing action or not-action Partial Least Squares Matrix Factorization (PLSMF) algorithm Multi-source model incorporating multiple signals

21 Ch2.2 PLSMF algorithm The PLSMF algorithm Phase I: Compute Q, where is computed by Phase II: Compute P, for all user i. (this step essentially solves an ordinary least squares) Q only need to be computed once in a while Computing P is embarrassingly parallel and can be done by mapreduce

22 Ch2.2 PLSMF algorithm Interpretation of PLSMF The Coocurrence Matrix: M T M # of users bought item 3 # of users bought item 2 and item 3

23 Latent factor 2 Q2[2, pidx] Ch2.2 PLSMF algorithm where are from Kung Fu Panda Bridesmaids Flush Away Rio Yogi Bear Gnomeo&Juliet Fast Five Transformers Star Wars Secretariat Inception The King s Speech Q2[1, pidx]

24 Latent factor 2 Q2[2, pidx] Ch2.2 PLSMF algorithm where are from Kung Fu Panda Bridesmaids Flush Away Rio Yogi Bear Gnomeo&Juliet Fast Five Transformers Star Wars Secretariat Inception The King s Speech Q2[1, pidx]

25 Ch2.3 Multi-source matrix factorization Interpretation of M T M Transaction # of users bought item 3 # of users bought item 2 and item 3

26 Ch2.3 Multi-source matrix factorization Interpretation of M T M Transaction + browsing Buy and buy View and buy View and buy View and view # of users viewed item 3 # of users viewed item 1 and viewed item 3 # of users bought item 3 and viewed item 3

27 Ch2.3 Multi-source Interpretation of M T M Transaction + browsing + geographic Buy given buy Buy given view Buy given geo View given buy View given view View given geo Geo given buy Geo given view Geo given geo # of users from region 1 # of users viewed item 2 given from region 1 # of users bought item 2 given from region 1

28 Chapter 2.3 Multi-source matrix factorization

29 Ch2.3 Online validation

30 Agenda Chapter 1: Atom/molecular interacts with its neighbors, so does our product Bundle recommendation in ecommerce Chapter 2: Manipulate at nano scale Personalized recommendation at individual customer level Chapter 3: Environment/context matters O2O initiatives at Walmart: pickup in store, WMX, savings catcher and mobile

31 Ch3: Seamless experience from online to offline, offline to online Pickup in store Mobile applications Savings Catcher Vendor Marketing

32 Ch3.1: Pickup in store The last mile battle in US ecommerce 90% of all Americans live within 15 miles of a Walmart

33 Ch3.2: Mobile Help shoppers in store check price, rating and reviews Find local coupons Express checkout Savings catcher

34 Ch3.3: Savings Catcher

35 Ch3.4: Vendor Marketing Online marketing is all about measurement One of every four dollars Americans spend on groceries is spent at Walmart Bigger data with more challenges

36 The End - Q&A?

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