Machine learning has enjoyed astounding practical
success in a wide range of applications in recent
years-practical success that often hurries ahead of our
theoretical understanding. The standard framework for machine
learning theory assumes full supervision, that is, training data
consists of correctly labeled iid examples from the same task
that the learned classifier is supposed to be applied to.
However, many practical applications successfully make use of
the sheer abundance of data that is currently produced. Such
data may not be labeled or may be collected from various
sources.
The focus of this thesis is to provide theoretical analysis of
machine learning regimes where the learner is given such
(possibly large amounts) of non-perfect training data. In
particular, we investigate the benefits and limitations of
learning with unlabeled data in semi-supervised learning and
active learning as well as benefits and limitations of learning
from data that has been generated by a task that is different
from the target task (domain adaptation learning).
For all three settings, we propose
Probabilistic Lipschitzness to model the relatedness between the labels and the underlying domain space, and we
discuss our suggested notion by comparing it to other common
data assumptions.
| Identifer | oai:union.ndltd.org:WATERLOO/oai:uwspace.uwaterloo.ca:10012/7925 |
| Date | January 2013 |
| Creators | Urner, Ruth |
| Source Sets | University of Waterloo Electronic Theses Repository |
| Language | English |
| Detected Language | English |
| Type | Thesis or Dissertation |
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