[Ml-stat-talks] Monday 9/26: Richard Socher on recursive deep learning

David Mimno mimno at CS.Princeton.EDU
Fri Sep 23 10:18:31 EDT 2011

Next week's Machine Learning lunch will be on MONDAY, in CS 302 (one
floor below the usual room) at 12:30.

Richard Socher, Stanford University

Recursive Deep Learning in Natural Language Processing and Computer Vision

Hierarchical and recursive structure is commonly found in different
modalities, including natural language sentences and scene images.  I
will present some of our recent work on three recursive neural network
architectures that learn meaning representations for such hierarchical
structure. These models obtain state-of-the-art performance on several
language and vision tasks.

The meaning of phrases and sentences is determined by the meanings of
its words and the rules of compositionality. We introduce a recursive
neural network (RNN) for syntactic parsing which can learn vector
representations that capture both syntactic and semantic information
of phrases and sentences. For instance, the phrases "declined to
comment" and "would not disclose" have similar representations.
Since our RNN does not depend on specific assumptions for language, it
can also be used to find hierarchical structure in complex scene
images. This algorithm obtains state-of-the-art performance for
semantic scene segmentation on the Stanford Background and the MSRC
datasets and outperforms Gist descriptors for scene classification by 4%.

The ability to identify sentiments about personal experiences,
products, movies etc. is crucial to understand user generated content
in social networks, blogs or product reviews. The second architecture
I will talk about is based on semi-supervised recursive autoencoders (RAE).
RAEs learn vector representations for phrases sufficiently well as to
outperform other traditional supervised sentiment classification methods
on several standard datasets.
Lastly, I describe an alternative unsupervised RAE model that can learn
features which outperform previous approaches for paraphrase
detection on the Microsoft Research Paraphrase corpus.

This talk presents joint work with Andrew Ng and Chris Manning.

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