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#!/usr/bin/env python |
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# -*- coding: utf-8 -*- |
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import theano |
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class Scanner(object): |
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""" |
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Call `theano.scan` with dictionary parameters. |
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""" |
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def __init__(self, func, sequences=None, outputs_info=None, non_sequences=None, **kwargs): |
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if ((sequences and type(sequences) != dict) or |
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(outputs_info and type(outputs_info) != dict) or |
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(non_sequences and type(non_sequences) != dict)): |
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raise Exception("The parameter `sequences`, `outputs_info`, `non_sequences` must be dict.") |
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self._func = func |
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self._sequence_keys = sequences.keys() if sequences else [] |
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self._sequence_values = sequences.values() if sequences else [] |
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self._output_keys = outputs_info.keys() if outputs_info else [] |
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self._output_values = outputs_info.values() if outputs_info else [] |
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self._non_sequence_keys = non_sequences.keys() if non_sequences else [] |
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self._non_sequence_values = non_sequences.values() if non_sequences else [] |
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self._kwargs = kwargs |
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def _func_wrapper(self, *vars): |
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all_values = self._sequence_values + self._output_values + self._non_sequence_values |
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all_keys = self._sequence_keys + self._output_keys + self._non_sequence_keys |
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valid_keys = [all_keys[i] for i in range(len(all_keys)) if all_values[i] is not None] |
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none_keys = [all_keys[i] for i in range(len(all_keys)) if all_values[i] is None] |
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dict_param = dict(zip(valid_keys, vars)) |
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dict_param.update(dict(zip(none_keys, [None for _ in range(len(none_keys))]))) |
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retval = self._func(dict_param) |
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if type(retval) == tuple: |
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dict_retval, updates = retval |
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else: |
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dict_retval, updates = retval, None |
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if type(dict_retval) != dict: |
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raise Exception("The return value of scanner function must be a dict") |
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final_retval = [dict_retval[k] for k in self._output_keys] |
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if len(final_retval) == 1: |
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final_retval = final_retval[0] |
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if updates: |
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return final_retval, updates |
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else: |
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return final_retval |
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def compute(self): |
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results, updates = theano.scan(self._func_wrapper, |
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sequences=filter(lambda t: t is not None, self._sequence_values), |
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outputs_info=self._output_values, |
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non_sequences=filter(lambda t: t is not None, self._non_sequence_values), |
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**self._kwargs) |
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if type(results) != list: |
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results = [results] |
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return dict(zip(self._output_keys, results)), updates |
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uaca /
deepy
