Mercurial > pylearn
comparison learner.py @ 78:3499918faa9d
In the middle of designing TLearner
| author | bengioy@bengiomac.local |
|---|---|
| date | Mon, 05 May 2008 09:35:30 -0400 |
| parents | 1e2bb5bad636 |
| children | c4726e19b8ec |
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| 77:1e2bb5bad636 | 78:3499918faa9d |
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| 55 Optionally, if copy_inputs, the input fields (of the input_dataset) can be made | 55 Optionally, if copy_inputs, the input fields (of the input_dataset) can be made |
| 56 visible in the output DataSet returned by this method. | 56 visible in the output DataSet returned by this method. |
| 57 """ | 57 """ |
| 58 raise NotImplementedError | 58 raise NotImplementedError |
| 59 | 59 |
| 60 def attribute_names(self): | |
| 61 """ | |
| 62 A Learner may have attributes that it wishes to export to other objects. To automate | |
| 63 such export, sub-classes should define here the names (list of strings) of these attributes. | |
| 64 """ | |
| 65 return [] | |
| 60 | 66 |
| 67 class TLearner(Learner): | |
| 68 """ | |
| 69 TLearner is a virtual class of Learners that attempts to factor out of the definition | |
| 70 of a learner the steps that are common to many implementations of learning algorithms, | |
| 71 so as to leave only "the equations" to define in particular sub-classes, using Theano. | |
| 72 | |
| 73 In the default implementations of use and update, it is assumed that the 'use' and 'update' methods | |
| 74 visit examples in the input dataset sequentially. In the 'use' method only one pass through the dataset is done, | |
| 75 whereas the sub-learner may wish to iterate over the examples multiple times. Subclasses where this | |
| 76 basic model is not appropriate can simply redefine update or use. | |
| 77 | |
| 78 Sub-classes must provide the following functions and functionalities: | |
| 79 - attributeNames(): defines all the names of attributes which can be used as fields or | |
| 80 attributes in input/output datasets or in stats collectors. | |
| 81 All these attributes are expected to be theano.Result objects | |
| 82 (with a .data property and recognized by theano.Function for compilation). | |
| 83 The sub-class constructor defines the relations between | |
| 84 the Theano variables that may be used by 'use' and 'update' | |
| 85 or by a stats collector. | |
| 86 - defaultOutputFields(input_fields): return a list of default dataset output fields when | |
| 87 None are provided by the caller of use. | |
| 88 - | |
| 89 | |
| 90 """ | |
| 91 |