hunch_net hunch_net-2005 hunch_net-2005-59 knowledge-graph by maker-knowledge-mining
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Introduction: Maverick Woo and the Aladdin group at CMU have started a CS theory-related blog here .
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Introduction: It’s been almost two years since this blog began. In that time, I’ve learned enough to shift my expectations in several ways. Initially, the idea was for a general purpose ML blog where different people could contribute posts. What has actually happened is most posts come from me, with a few guest posts that I greatly value. There are a few reasons I see for this. Overload . A couple years ago, I had not fully appreciated just how busy life gets for a researcher. Making a post is not simply a matter of getting to it, but rather of prioritizing between {writing a grant, finishing an overdue review, writing a paper, teaching a class, writing a program, etc…}. This is a substantial transition away from what life as a graduate student is like. At some point the question is not “when will I get to it?” but rather “will I get to it?” and the answer starts to become “no” most of the time. Feedback failure . This blog currently receives about 3K unique visitors per day from
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Introduction: Pat (the practitioner) I need to do multiclass classification and I only have a decision tree. Theo (the thoeretician) Use an error correcting output code . Pat Oh, that’s cool. But the created binary problems seem unintuitive. I’m not sure the decision tree can solve them. Theo Oh? Is your problem a decision list? Pat No, I don’t think so. Theo Hmm. Are the classes well separated by axis aligned splits? Pat Err, maybe. I’m not sure. Theo Well, if they are, under the IID assumption I can tell you how many samples you need. Pat IID? The data is definitely not IID. Theo Oh dear. Pat Can we get back to the choice of ECOC? I suspect we need to build it dynamically in response to which subsets of the labels are empirically separable from each other. Theo Ok. What do you know about your problem? Pat Not much. My friend just gave me the dataset. Theo Then, no one can help you. Pat (What a fuzzy thinker. Theo keeps jumping t
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