the missing __init__ file

theano/sandbox/scan_module/__init__.py

+"""
+This module provides the Scan Op
+
+Scanning is a general form of recurrence, which can be used for looping.
+The idea is that you *scan* a function along some input sequence, producing
+an output at each time-step that can be seen (but not modified) by the
+function at the next time-step. (Technically, the function can see the
+previous K  time-steps of your outputs and L time steps (from the past and
+future) of your inputs.
+
+So for example, ``sum()`` could be computed by scanning the ``z+x_i``
+function over a list, given an initial state of ``z=0``.
+
+Special cases:
+
+* A *reduce* operation can be performed by returning only the last
+  output of a ``scan``.
+* A *map* operation can be performed by applying a function that
+  ignores previous steps of the outputs.
+
+Often a for-loop can be expressed as a ``scan()`` operation, and ``scan`` is
+the closest that theano comes to looping. The advantage of using ``scan``
+over for loops is that it allows the number of iterations to be a part of
+the symbolic graph.
+
+The Scan Op should typically be used by calling any of the following
+functions: ``scan()``, ``map()``, ``reduce()``, ``foldl()``,
+``foldr()``.
+"""
+
+
+__docformat__ = 'restructedtext en'
+__authors__ = ("Razvan Pascanu "
+               "Frederic Bastien "
+               "James Bergstra "
+               "Pascal Lamblin "
+               "Arnaud Bergeron ")
+__copyright__ = "(c) 2010, Universite de Montreal"
+__contact__ = "Razvan Pascanu <r.pascanu@gmail>"
+
+from scan import scan