Getting Started with Deep Learning Seth Juarez sethjuarez
- Slides: 79
Getting Started with Deep Learning Seth Juarez @sethjuarez Microsoft aka. ms/myq
machine learning • finding (and exploiting) patterns in data • replacing “human writing code” with “human supplying data” • system figures out what the person wants based on examples • need to abstract from “training” examples to “test” examples • most central issue in ML: generalization • starts with a sharp question
machine learning • how much / how many • which class does this belong to? • are there different groups? which does it belong to? • is this weird? • which option should I choose?
unsupervised learning machine learning • (regression) how much / how many • (classification) which class does this belong to? • (clustering) are there different groups? which does it belong to? • (anomaly detection) is this weird? • (recommendation) which option should I choose?
process identify predict 1 explore analyze encode 4 model 2 3
identify data Class Outlook Temp. Windy Play Sunny Low Yes No Play Sunny High No Play Overcast Low Yes Play Overcast High No Play Overcast Low No No Play Rainy Low Yes Play Rainy Low No ? Sunny Low No label (y) play / no play features outlook, temp, windy values (x) [Sunny, Low, Yes]
explore / analyze / clean Class Outlook Temp. Windy Play Sunny Lowest Yes No Play ? High Yes No Play Sunny High Kind. Of Play Overcast Low Yes Play Turtle Cloud High No Play Overcast ? No No Play Rainy Low 28% Play Rainy Low No ? Sunny Low No yak shaving Any apparently useless activity which, by allowing you to overcome intermediate difficulties, allows you to solve a larger problem. I was doing a bit of yak shaving this morning, and it looks like it might have paid off. wikipedia
explore / analyze / clean Class Outlook Temp. Windy Play Sunny Low Yes No Play Sunny High No Play Overcast Low Yes Play Overcast High No Play Overcast Low No No Play Rainy Low Yes Play Rainy Low No ? Sunny Low No
model Class Outlook Temp. Windy Play Sunny Low Yes No Play Sunny High No Play Overcast Low Yes Play Overcast High No Play Overcast Low No No Play Rainy Low Yes Play Rainy Low No ? Sunny Low No
predict Class ? Outlook Sunny PLAY!!! Temp. Low Windy No
how well is it doing? train Use ~80% test Use ~20%
how well is it doing? train Use ~80% dev Use ~10% test Use ~10%
confusion matrix Truth negative Guess positive true false
finding an h • in order to classify things properly we need: • a way to mathematically represent examples • a way to separate classes (yes/no) • “decision boundary” • excel example • graph example
Updated W Current W Learning Rate Derivative of Cost Function
so far… •
Tensor. Flow • Step 1 – Define a Graph • Step 2 – Start a Session • Step 3 – Run!
Tensor. Flow – Building the Graph placeholders graph variables constants x, y, model, cost, accuracy, optimization…
http: //www. asimovinstitute. org/neural-network-zoo/
summary •
summary • Tensor. Flow is a framework that can help. • steps • define graph • start session • run training
summary • Learn more about • • • Cognitive Services – https: //cda. ms/n 4 Azure ML – https: //cda. ms/n 5 Deep Learning VMs - https: //cda. ms/n 6 Batch AI – https: //cda. ms/n 7 Windows ML – https: //cda. ms/n 8 • Get a hold of me! • seth. juarez@microsoft. com • @sethjuarez
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