property

The body of make_node has been updated to make use of the newly revised
methods of scan to parse arguments, hopefully increasing clarity.

The make_node function used to check if inputs of the scan op have the same
type. In order to do so it has to parse them, This comments indicate the
convention in naming variables when this check is done (so that there is no
confusion between the variables representing the inputs of the lambda
functions, i.e. slices of the inputs and the actual inputs).

Scan arguments are ordered, and depending on the index, an argument
can be a sequence, a state/output or a non sequence. The scan op has methods
that given the full list of arguments returns only those that represent a
certain category of inputs. The old functions used to look at self.inputs,
self.outputs or node.inputs/node.outputs to determine those entries. This
approach was restrictive, since all functions on scan most of the time work
on clones of the original arguments. The new functions now take a list of
arguments (could be either the original or clones).

edited NEWS.txt

Added new command 'theano-cache unlock'

This can be used to unlock the compilation directory without having to wait
two minutes, or having to manually delete a file.

Minor fix in an theano/tensor/blas.py.

First version of file for the release candidate.

Changed argmax dtype from int32 to int64

Refactored GPU install instructions

Also refactored a bit GPU tips, and removed the note about limitation to
4 GPUs (which is not true anymore).

Moved instructions from "Using the GPU" tutorial page to the intallation
instructions.

Added a link from installation instructions to the "Using the GPU"
tutorial.

Minor stuff

Fix argmax grad

Some test fixes

Fixed some tests with compute_test_value = ignore

Now also testing gradient with axis=None (failing as of this commit).

If 'axis' is empty then x.ndim must be equal to zero, and thus we also
have 'axis == range(x.ndim)'.
If x.ndim in non-zero, there is no reason for axis to be empty, so
better not catch this case.

Windows requires pickled files to be opened in binary mode.

Also rewrote file operations to be safer.

Fixed test_lazy.py and test_vm.py

Everything looks fine.

Fixed test_vm.py:TestCallbacks.test_callback_with_ifelse.

Two tests are now failing in test_vm.py

This is safer on 64 bit computers, and remains platform-independent.