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Theano 0.6.0rc1

Optimizing compiler for evaluating mathematical expressions on CPUs and GPUs.

Latest Version: 0.6.0

Theano is a Python library that allows you to define, optimize, and efficiently evaluate mathematical expressions involving multi-dimensional arrays. It is built on top of NumPy_. Theano features:

 * **tight integration with NumPy:** a similar interface to NumPy's. numpy.ndarrays are also used internally in Theano-compiled functions.
 * **transparent use of a GPU:** perform data-intensive computations up to 140x faster than on a CPU (support for float32 only).
 * **efficient symbolic differentiation:** Theano can compute derivatives for functions of one or many inputs.
 * **speed and stability optimizations:** avoid nasty bugs when computing expressions such as log(1 + exp(x)) for large values of x.
 * **dynamic C code generation:** evaluate expressions faster.
 * **extensive unit-testing and self-verification:** includes tools for detecting and diagnosing bugs and/or potential problems.

Theano has been powering large-scale computationally intensive scientific
research since 2007, but it is also approachable enough to be used in the
classroom (IFT6266 at the University of Montreal).

.. _NumPy: http://numpy.scipy.org/


.. _NEWS:

Updates in the Trunk since the last release:

https://github.com/Theano/Theano/wiki/Devnews

=============
Release Notes
=============

Theano 0.6rc1 (1 October 2012)
==============================

Highlight:
 * Bug fix, crash fix, CPU and GPU speed up.
 * theano_var.eval({other_var:val[,...]} to simplify the usage of Theano (Ian G.)
 * New default linker `cvm`. This is the execution engine that tell what op to run in witch order.
   It is now implemented in C and enable lazy evaluation of ifelse op.
 * Faster theano.function compilation. (Pascal L., Ian G.)
 * Big sparse submodule update and documentation of it. (Nicolas Bouchard)
 * Use GPU asynchronous functionality (Frederic B.)
 * Better Windows support.

Known bug:
 * A few crash case that will be fixed by the final release.

Bug fixes:
 * Outputs of Scan nodes could contain corrupted values: some parts of the
   output would be repeated a second time, instead of the correct values.
   It happened randomly, and quite infrequently, but the bug has been present
   (both in Python and Cython) since April 2011. (Pascal L.)
 * In Sparse sandbox, fix the grad of theano.sparse.sandbox.sp.row_scale.
   It did not return the right number of elements. (Frederic B.)
 * set_subtensor(x[int vector], new_value) when moved to the GPU
   was transformed into inc_subtensor on the GPU. Now we have a correct
   (but slow) GPU implementation.
   Note 1: set_subtensor(x[slice[,...]], new_value) was working correctly
   in all cases as well as all inc_subtensor.
   Note 2: If your code was affected by the incorrect behavior, we now print
   a warning by default (Frederic B.)
 * Fixed an issue whereby config values were used as default arguments,
   with those defaults then stuck at old values if the config variables were
   changed during program execution. (David W-F)
 * Fixed many subtle bugs involving mutable default arguments which may have
   led to unexpected behaviour, such as objects sharing instance variables
   they were not supposed to share. (David W-F)
 * Correctly record the GPU device number used when we let the driver select it.
   (Frederic B.)
 * CAReduce with NaN in inputs don't return the good output. (Pascal L.)
     * This is used in tensor.{all,any,max,mean,prod,sum} and in the grad of PermuteRowElements.
 * The grad of TensorDot, was returning the wrong shape for some combination of axes.
   We now raise NotImplementedError in those cases. (Frederic B.)
 * conv2d with subsample >2 returned wrong values. (Pascal L.)
     * Fixed when mode==valid, disabled when mode==full
 * theano.sparse.CSMGrad op(generated by the grad of CSM) didn't
   handle unsorted input correctly and grapdient that are more sparse
   then the input. In that case, bad result was returned. But this can
   happen only when a sparse input of a Theano function was not
   sorted. This happen for example with sparse advanted indexing from
   scipy. The conclusion is most of time Nan in the graph.
   (Yann Dauphin)
 * theano.sparse._dot(CSC matrix, dense) optimized version UsmmCSCDense didn't handled
   correctly not contiguous inputs/outputs. (Pascal L.)
 * Fix a corner case CVM updates case. (Pascal L.)
   This happen is the update to a shared variable is itself after optimization.
   The CVM was not used by default.
 * Fix the view_map of sparse.Transpose and sparse.sandbow.sp.RowScale. (Frederic B.)
   This probably didn't cause problem as there is only the UsmmCscDense op
   (used call to Usmm wieh CSC matrix) that could interfere with them.

Deprecation:
 * Deprecated the Module class (Ian G.)
   This was a predecessor of SharedVariable with a less pythonic phylosophy.

Interface changes:
 * Now the base version requirement are numpy >= 1.5.0 and the optional scipy >= 0.8.
 * In Theano 0.5, we removed the deprecated sharedvar.value property.
   Now we raise an error if you access it. (Frederic B.)
 * theano.function does not accept duplicate inputs, so function([x, x], ...)
   does not work anymore. (Pascal L.)
 * theano.function now raises an error if some of the provided inputs are
   not part of the computational graph needed to compute the output, for
   instance, function([x, y], [y]). You can use the kwarg
   ``on_unused_input={'raise', 'warn', 'ignore'}`` to control this.
   (Pascal L.)
 * New Theano flag "on_unused_input" that define the default value of the
   previous point. (Frederic B.)
 * tensor.alloc() now raises an error during graph build time
   when we try to create less dimensions than the number of dimensions
   the provided value have. In the past, the error was at run time.
   (Frederic B.)
 * Remove theano.Value and related stuff (Ian G.)
   This was a test of what ended up as SharedVariable.
 * Renamed Env to FunctionGraph, and object attribute "env" to "fgraph" (Ian G.)
   Deprecation warning printed when you try to access the "env" attribute.
 * Renamed the FunctionGraph.nodes attribute to FunctionNodes.apply_nodes (Ian G.)
 * Warn when we don't handle correctly the parameter in Theano flags `nvcc.flags`
   (Frederic B.)
 * Do not reorder the user flags passed to the compiler. They get set after other flags.(Frederic B.)
 * Make setuptools optional (Ilan Schnell+)/Remove Dependency.
 * We warn when a user try to use an old GPU what we don't test with.
   This could cause crash and will also be very slow. (Frederic B.)
 * Make theano.grad able to differentiate between not implemented, undefined and disconnected grad.
   Op.grad function should return theano.gradient.{grad_not_implemented,grad_undefined} or
   something of DisconectedType (Ian G.)
 * Make theano.grad expect to always receive a float or undefined
   gradient and inforce that op with integers output values always
   return 0. (Ian G.)


New memory output contract(was told about in the release note of Theano 0.5):
 * Now the output memory received can be preallocated by other stuff.
   In the past it was always the previous output an Apply node allowcated.
   So this mean that the shape and strides can be different the from previous call
   and there can be link to this memory at other place.
   This mean it could receive preallocated output that is not c_contiguous.
   But we don't do that now. (Pascal L.)
 * New Theano flags to test this DebugMode.check_preallocated_output (Pascal L.)
 * Updated the a few ops to respect this contract (Pascal L.)


New Features:
 * GPU scan now work (don't crash) when there is a mixture of float32 and other dtypes.
 * theano_var.eval({other_var:val[,...]} to simplify the usage of Theano (Ian G.)
 * debugprint new param ids=["CHAR", "id", "int", ""]
   This makes the identifier printed to be the python id, a unique char, a
   unique int, or not have it printed. We changed the default to be "CHAR"
   as this is more readable. (Frederic B.)
 * debugprint new param stop_on_name=[False, True]. If True, we don't print
   anything below an intermediate variable that has a name. Defaults to False.
   (Frederic B.)
 * debugprint does not print anymore the "|" symbol in a column after the last input. (Frederic B.)
 * If you use Enthought Python Distribution (EPD) now we use its blas
   implementation by default. (Frederic B., Graham Taylor, Simon McGregor)
 * MRG random now raises an error with a clear message when the passed shape
   contains dimensions with bad value like 0. (Frederic B. reported by Ian G.)
 * "CudaNdarray[*] = ndarray" works in more cases (Frederic B.)
 * "CudaNdarray[*] += ndarray" works in more cases (Frederic B.)
 * We add dimensions to CudaNdarray to automatically broadcast more frequently.
   (Frederic B.)
 * New theano flag cmodule.warn_no_version. Default False. If True,
   will print a warning when compiling one or more Op with C code that
   can't be cached because there is no c_code_cache_version() function
   associated to at least one of those Ops.  (Frederic B.)
 * CPU alloc now always generate C code (Pascal L.)
 * New Theano flag cmodule.warn_no_version=False. When True, warn when an op
   with C code is not versioned (which forces to recompile it everytimes).
   (Frederic B.)
 * C code reuses preallocated outputs (only done by Scan) (Pascal L.)
 * Garbage collection of intermediate results during Theano function calls
   for Ops with C code (Pascal L.)
 * Theano flags compiledir_format now support the parameter "numpy_version" and "g++". (Frederic B.)
 * Theano GPU variables, shared variable and constant now support <, <=,
   > and >= as as those not on the GPU.
 * AdvancedIncSubtensor now support the set_instead_of_inc parameter. (Eric L.)
 * Added Advanced Indexing support to inc_subtensor and set_subtensor. (Eric L.)
 * theano.tensor.{any,all,std,var,mean,prod,sum,argmin,argmax,min,max,max_and_argman}
   have a new parameter keepdims (Eric L.)
   This allow to broadcast it correctly again the input data to normalize it.
 * The Updates object now check that the key are SharedVariable when we pass them
   in the __init__ function. (Pascal L.)
 * Set a Theano Variable name on transposed op when the input have one (Frederic B).
 * The cvm linker now support garbage collection (enabled by default). (James B. Arnaud B., Pascal L.)
 * The cvm linker is now the default linker.
   This make the "loop" around the execution of apply node in C. So this lower the overhead.
 * theano_variable[numpy.newaxis] is now supported (James B.)
 * Enable ifelse on the GPU. (Frederic B.)
 * Correctly support numpy.memmap everywhere (Pascal L.)
   We add partial support for them before. Just use the normal tensor operation
   on them and it should work.
   But take care to don't exhaust your computer memory! (we always generate normal ndarray)
 * Add an optimization that stabilize log(softmax(x)). (Ian G.)
 * Re-enable the Images2Neibs grad. It was not broken, the problem was how we tested it. (Frederic B.)
 * If `theano_fn.trust_input` is set to False, do not check if the input are good
   when calling the theano function. (Frederic B.)
 * Add theano.tensor.blas,gem{m,v} as shortcut.
 * theano.grad(..., add_names=True). False for the old
   behavior. Otherwise it tries to name the grad variables. (Ian G.)
 * theano-nose (Pascal L.)
   A wrapper around nosetests that add needed extension.
   * --profile-time option, print time spend in each tests (Eric L.)
   * --batch option, allow to run tests in batch to lower memory requirement.
 * m = mean(log(1 - sigm(x)))
   x - scalar * theano.grad(m, x)
   There is a stabilization optimization for this.
   Now it is applied more frequently. (Pascal L.)


New Op/function:
 * Added element-wise operation theano.tensor.{GammaLn,Psi} (John Salvatier, Nicolas Bouchard)
 * Added element-wise operation theano.tensor.{arcsin,arctan,arccosh,arcsinh,arctanh,exp2,arctan2} (Nicolas Bouchard)
 * Added element-wise operation theano.tensor.{gamma,conj,complex_from_polar,expm1,deg2rad,rad2deg,trunc,gamma} (Nicolas Bouchard)
 * Added theano.tensor.argsort that wraps numpy.argsort (Hani Almousli).
 * Added theano.tensor.diff that wrap numpy.diff (Nicolas B.)
 * Added theano.tensor.bincount that wrap numpy.bincount (Nicolas B., Pascal L, Frederic B.)
 * Added theano.tensor.squeeze (Nicolas B.)
   This remove broadcasted dimensions from the variable.
   Theano-nesque version of numpy.squeeze.
 * Added theano.tensor.repeat that wrap numpy.repeat (Nicolas B. + PL)
 * Added theano.tensor.bartlett that wrap  numpy.bartlett (Eric L.)
 * Added theano.tensor.fill_diagonal that wrap numpy.fill_diagonal (Eric L., Frederic B.)
 * Added tensor.square that is an alias for tensor.sqr as NumPy (Ian G.)
 * Added theano.tensor.load(path, dtype, broadcastable, mmap_mode=None) op
   that allow to load a .npy file in a theano graph (Matthew Rocklin)
 * theano.sandbox.linalg.kron.py:Kron op. (Eric L.)
   Kronecker product

Speed up:
 * CPU convolution are now parallelized (Frederic B.)
   By default use all cores/hyper-threads
   To control it, use the `OMP_NUM_THREADS=N` environment variable where N is the number of
   parallel thread to use. By default it is equal to the number of CPU cores/hyper
   threads that you have.
   There is a new Theano flags `openmp` to allow/disallow openmp op.
   If you BLAS library is parallelized, this flag won't affect it, but the
   env variable will.
 * Remove a corner case where du duplicated dot22/gemm in the graph. (Frederic B., Ian G.)
 * Enable fusion of elemwise that have the same clients multiple time. (Frederic B.)
 * New optimization: Remove reduction over broadcastable dimensions (James B., Frederic B.)
 * Faster theano.function compilation. (Pascal L., Ian G.)
 * Remove GPU transfer around specify_shape op. (Frederic B.)
 * Implemented/tested MANY op.infer_shape method (Eric Larsen)
   This allow Theano to make better shape inferance.
 * Implement Solve.infer_shape (Matthew Rocklin)
 * Scan memory optimization now work more frequently. (Razvan P.)
   There was warning printed by the subtensor optimization in those cases.
 * faster rng_mrg python code. (mostly used for tests) (Frederic B.)

Speed up GPU:
 * Convolution on the GPU now check the generation of the card to make
   it faster in some cases (especially medium/big ouput image) (Frederic B.)
   * We had hardcoded 512 as the maximum number of thread per block. Newer card
     support up to 1024 threads per block.
 * Faster GpuAdvancedSubtensor1, GpuSubtensor, GpuAlloc (Frederic B.)
 * We now pass the GPU architecture to nvcc when compiling (Frederic B.)
 * Now we use the GPU function async feature by default. (Frederic B.)
   Set the environment variable `CUDA_LAUNCH_BLOCKING` to `1` to disable this
   for profiling or debugging.
 * Faster creation of CudaNdarray objects (Frederic B.)
 * Now some Max reduction are implemented on the GPU. (Ian G.)

Sparse Sandbox graduate (moved from theano.sparse.sandbox.sp):
 * sparse.remove0 (Frederic B., Nicolas B.)
 * sparse.sp_sum(a, axis=None) (Nicolas B.)
   * bugfix: the not structured grad was returning a structured grad.
 * sparse.{col_scale,row_scale,ensure_sorted_indices,clean} (Nicolas B.)
 * sparse.{diag,square_diagonal} (Nicolas B.)

Sparse:
 * Support for uint* dtype.
 * Implement theano.sparse.mul(sparse1, sparse2) when both inputs don't
   have the same sparsity pattern. (Frederic B.)
 * New Ops: sparse.{expm1,deg2rad,rad2deg,trunc} (Nicolas B.)
 * New Ops: sparse.{sqrt,sqr,log1p,floor,ceil,sgn,round_half_to_even} (Nicolas B.)
 * New Ops: sparse.{arctanh,tanh,arcsinh,sinh,arctan,arcsin,tan,sin} (Nicolas B.)
 * New functions: structured_{add,exp,log,pow,minimum,maximum,sigmoid} (Yann D., Nicolas B.)
     * Op optimized op: StructuredAddSV, StrucutedAddSVCSR (inserted automatically)
 * New Op: sparse.mul_s_v multiplication of sparse matrix by broadcasted vector (Yann D.)
 * New Op: sparse.Cast() (Yann D., Nicolas B.)
   * Add sparse_variable.astype() and theano.sparse.cast() and
     theano.sparse.{b,w,i,l,f,d,c,z}cast() as there tensor equivalent (Nicolas B.)
 * Op class: SamplingDot (Yann D., Nicolas B.)
   * Optimized version: SamplingDotCsr, StructuredDotCSC
   * Optimization to inster the optimizer version: local_sampling_dot_csr, local_structured_add_s_v
 * New Ops: sparse.{Multinomial,Poisson,Binomial}(Yann D., NB)
 * Implement the CSMProperties grad method (Yann Dauphin)
 * Move optimizations to theano/sparse/opt.py (Nicolas B.)

New flags:
 * `profile=True` flag now print a printing of the sum of all printed profile.(Frederic B.)
   * It work with the linker vm/cvm(default).
   * Also print compile time, optimizer time and linker time.
   * Also print a summary by op class.
 * new flag "profile_optimizer" (Frederic B.)
   when profile=True, will also print the time spent in each optimizer.
   Useful to find optimization bottleneck.
 * new flag "cmodule.remove_gxx_opt" (Frederic B.)
   If True, will remove -O* parameter passed to g++.
   This is useful to debug in gdb module compiled by Theano.
   The parameter -g is passed by default to g++.
 * new flag cmodule.compilation_warning
   if True, will print compilation warning.
 * new flag `allow_gc` (Frederic B.)
   When False, do not garbage collect intermediate results when they are not needed.
   This use more memory, but allocate memory less frequently so faster.
 * new flag `vm.lazy` (Frederic B.)
   Useful only for the vm linkers. When lazy is None,
   auto detect if lazy evaluation is needed and use the apropriate
   version. If lazy it True/False, force the version used between
   Loop/LoopGC and Stack.
 * new flag `cxx`. This is the c++ compiler to use. If empty do not compile c code. (Frederic B.)
 * New flag `print_active_device` flag that default to True. (Matthew R.)

Documentation:
 * Added in the tutorial documentation on how to extend Theano.
   This explains how to make a Theano Op from a Python function.
   http://deeplearning.net/software/theano/tutorial/extending_theano.html
   (Frederic B.)
 * New installation instructions for Windows using EPD (Pascal L.)
 * New installation on Windows by using a Linux VM from ContinuumIO (Frederic B.)
 * Revisions of Theano tutorial and addition of exercices to it. (Eric L.)
 * New tutorial on Sparse variable. (Nicolas B., Sebastien Lemieux, Frederic Bastien
   http://www.deeplearning.net/software/theano/tutorial/sparse.html
 * Installation documentation for CentOS6 (Frederic B.)
 * Installation documentation for Ubuntu (with GPU) (Frederic B., Matthias Zoehrer)
 * Doc type fix, Doc update, Better error messag: Olivier D., David W.F., Frederic B., James B., Matthew Rocklin, Ian G.
 * Python Memory Management (Steven Pigeon, Olivier D.)

Proposal:
 * Math framework for complex gradien (Pascal L.)


Internal changes:
 * Define new exceptions MissingInputError and UnusedInputError, and use them
   in theano.function, instead of TypeError and ValueError. (Pascal L.)
 * Better handling of bitwidth and max values of integers and pointers
   across platforms (Pascal L.)
 * Made a few Ops with C code versioned to reduce compilation time.
   (Frederic B, Pascal L.)
 * Better deletion of files in the compiledir (Frederic B.)
 * Safer import on sort op (Nicolas Pinto)
 * hash_from_dict for elemwise op (Fredric B.)
 * Renamed BadCLinkerOutput into BadThunkOutput. (PL)
 * tensor.utils.shape_of_variables (Matthew R.)
 * Add the numpy abi version and g++/nvcc version in the key of compiled code. (Frederic B.)
 * env.replace_all_validate_remove (Frederic B.)
   This allow global optimizer to ensure it removed some nodes from the graph.
   This is a generic way to catch error that would otherwise duplicate
   computation.
   * It was used for GEMM and Scan optimization (Frederic B., Razvan P.)
 * Fix how exception are raised in GPU code (James B.)
 * Made code respect pep8: OD, Fred, Pascal L., Nicolas Bouchard, Eric Larsen and others.
 * TensorType and CudaNdarrayType now have a value_zeros method that call CudaNdarray.zeros or
   numpy.zeros with the right dtype. (Pascal L., Olivier D.)
   This allow to have the same code work with both type.
 * Renamed FunctionGraph.extend function to FunctionGraph.attach_feature. (Ian G.)
 * New exception MissingGXX when we try to compile but there is no cxx compiler. (Frederic B.)
 * New fct theano.gof.utils.give_variables_names(...) that give unique name to variable. (Matthew R.)
 * Use most of the time the new NumPy C-API for later NumPy release. (Frederic B.)
 * New theano.gof.sched.sort_apply_nodes() that will allow other execution ordering. (Matthew R.)
 * New attribute sort_schedule_fn, a way to specify a scheduler to use. (Matthew R.)

Crash Fix:
 * Fix import conflict name (usaar33, Frederic B.)
    * This make Theano work with PiCloud.
 * Do not try to use the BLAS library when blas.ldflags is manually set to an
   empty string (Frederic B., Pascal L.)
 * When importing theano on a computer without GPU with the Theano
   flags 'device' or 'init_gpu_device' set to gpu* (Frederic B., reported by  Luo Heng)
 * Optimization printed a useless error when scipy was not available. (Frederic B.)
 * GPU conv crash/slowdown on newer hardware (James B.)
 * Better error handling in GPU conv (Frederic B.)
 * GPU optimization that moves element-wise Ops to the GPU. Crash happened in
   a particular execution order of this optimization and the
   element-wise fusion optimization when upcasting some inputs to
   float32 (to compute them on the GPU).
   (Frederic B., reported by Sander Dieleman)
 * GpuReshape in some particular case when the input is not contiguous
   (Frederic B., reported by Sander Dieleman)
 * GpuSoftmaxWithBias with shape (0, N) with N > 1.
   (Frederic B., reported by Razvan P.)
 * Fix crash under 64-bit Windows, when taking subtensors of the form a[n:]
   (Pascal L., reported by Simon McGregor)
 * Fixed issue with the MaxAndArgmax Op not properly preserving broadcastable
   dimensions, which could typically result in optimization crashes (Olivier D.)
 * Fixed crash when concatenating some arrays with specific broadcasting
   patterns (Olivier D.)
 * Work around a known issue with nvcc 4.1 on MacOS X. (Graham Taylor)
 * In advanced indexing, if some inputs are constant, no need to call constant(...)
   on their value any more. (Pascal L., reported by John Salvatier)
 * Fix crash on GPU when the GpuSubtensor didn't put the right stride
   when the results tensor had a dimensions with size of 1. (Pascal L,
   reported Graham T.)
 * Fix scan crash that made it not run on the GPU in one case. (Guillaume D.)
 * If you grad again a random state, don't crash (Razvan P.)
 * GpuDownsampleFactorMax and its grad with inputs dimensions 0 and 1 bigger then 65535.
   (Frederic B. reported by Gabe Schwartz)
 * Potential crash due to parallel compilation when importing theano.sandbox.cuda
   (Olivier D.)
 * Crash fix on python 2.4 with slicing. (Pascal L.)
 * grad of argmin and argmax (Razvan P.)
 * Don't compute the Rop for shared variable with updates(mostly random).
   We don't use them and they caused crash. (Razvan P.)
 * MaxArgmax.grad() when one of the gradient it receive is None. (Razvan P, reported by Mark Fenner)
 * Fix crash of GpuSum when some dimensions shape was 0. (Frederic B.)

Tests:
 * Use less memory (Olivier D.)(frix crash on 32-bits computers)
 * Fix test with Theano flag "blas.ldflags=". (Frederic B., Pascal L.)
 * Fix crash with advanced subtensor and numpy constant.
 * Fix random tests crash due to random value. (Pascal L.)
 * Always introduce Alloc node when calling alloc and let the optimizer remove them if needed.
   This allow DebugMode to catch some shape error. (Pascal L.)
 * DebugMode now check the view_map for all type of Theano variable.
   It was doing only variable of tensor type. (Frederic B.)

Others:
 * Remove python warning for some python version. (Gabe Schwartz)
 * Remove useless fill op in fast_compile mode to make the graph more readable. (Fredric B.)
 * Remove GpuOuter as it is a subset of the new GpuGer (Frederic B.)
 * Now we use http://travis-ci.org/ to run all CPU tests (without SciPy)
   with the default mode on all Pull Requests.
   This should make the trunk more stable. (Fredric B.)
 * Our nightly buildbot now check on python 2.4(Frederic B.)
   This should make the trunk work on it more frequently.

Other thanks:
 * blaxill reported an error introduced into the trunk.

New stuff that will probably be reworked/removed before the release:
 * Better PyCUDA sharing of the GPU context.(fix crash at exit) (Frederic B.)
   TODO: there is still a crash at exit!
 
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