Merge pull request lisa-lab#1069 from nouiz/news

Updated NEWS.txt for 0.6rc2.

Author: nouiz

NEWS.txt

@@ -3,6 +3,123 @@
 Updates in the Trunk since the last release:
 
 https://github.com/Theano/Theano/wiki/Devnews
+git log rel-0.6rc1.. | grep --color=auto -i merge | less
+done up to PR 1084
+
+
+=============
+Release Notes (DRAFT)
+=============
+
+Theano 0.6rc2 (November ?st, 2012)
+=================================
+
+Highlight:
+ * Fix a few regression inserted in 0.6rc1
+ * A few new features.
+ * Speed up.
+ * Scan fix.
+ * Crash fix
+
+Commiters for this rc2 only:
+Razvan Pascanu
+Pascal Lamblin
+Frederic Bastien
+Ian Goodfellow
+Jeremiah Lowin
+Caglar Gulcehre
+Jey Kottalam
+Matthew Rocklin
+abalkin
+
+
+Regression in 0.6rc1 fixed:
+ * Fix the scan gradient dtype issue. In 0.6rc1, some upcast where inserted. (Razvan P.)
+ * Now grad() will do as before the 0.6rc1 for float, i.e. the grad dtype will be the same as the inputs inside the graph. If you ask for the direct grad, it will return the computed dtype. (Pascal L.)
+
+Wrong results fix:
+ * Scan fix in some case didn't returned the good results. (Razvan P., reported by Jeremiah L.)
+   This happen if you have a state with only neg tap and the outputs of the state is a function of some sequence.
+   If you have multiple state, there was no problem.
+ * Fixed bug in Scan with multiple outputs,
+   where one output would sometimes overwrite another one. (Razvan P.)
+ * Clip.grad treated the gradient with respect to the clipping boundary as always 0. (Ian G.)
+
+Interface change:
+ * Now we do not support unaligned ndarray in python code. (Frederic B.)
+   We did not support it in c code and supporting it in python code made
+   the detection harder.
+ * Now we only support officialy scipy 0.7.2 and numpy 1.5.0 (Frederic B.)
+   We weren't and aren't testing with older version.
+ * The theano.sparse.SparseType is available even when scipy is not (Frederic B.)
+ * Fixes issue where members of consider_constant grad parameter
+   were treated differently from Constant variables. (Ian G.)
+ * Remove the parameter g_cost to theano.grad(). (Ian G.)
+   Use the new more powerfull parameter known_grads instead.
+
+NumPy interface support:
+ * theano.tensor.where is an alias for theano.tensor.switch to support NumPy semantic. (Ian G.)
+ * TensorVariable objects now have dot, argmin, argmax, clip, conj, repeat, trace, std, round,
+   ravel and argsort functions and the real and imag properties as numpy.ndarray object.
+   The functionality was already available in Theano. (abalkin)
+
+Speed up:
+ * A C version of the SoftMax op (Razvan P.)
+   There was c code for the softmax with bias code.
+ * Faster GpuIncSubtensor (Ian G.)
+ * Faster copy on the GPU for 4d tensor. (Ian G.)
+ * The fix of flatten infer_shape re-enable an optimization (Pascal L.)
+   * The bug was introduced in 0.6rc1.
+ * Enable inc_subtensor on the GPU when updating it with a float64 dtype. (Ian G.)
+   It was causing an optimization warning.
+ * Make DeepCopy reuse preallocated memory. (Frédéric B.)
+ * Move then convolution to the GPU when the image shape and logical image shape differ. (Frédéric Bastien)
+ * C code for the View Op (Razvan P., Pascal L.)
+
+New Feature:
+ * Added a monitoring mode "MonitorMode" as a debugging tool. (Olivier D.)
+ * Allow integer axes when keepdims==True (Jeremiah Lowin)
+ * Add erfinv and erfcinv op. (Jey Kottalam)
+ * Added tensor.batched_dot(). (Caglar Gulcehre)
+   It use scan behind the scene, but making doing this easier.
+ * theano.get_constant_value(x) (Frederic B.)
+   This try to do have x as a constant int.
+   This do some constant folding to try to convert x into an int.
+   Used by some optimization.
+ * Add theano.tensor.io.{MPIRecv,MPIRecvWait,MPISend,MPISendWait} (Matthew Rocklin)
+   Theano do not automatically use them. It is up to you to use them and split your computation.
+ * Added theano.sandbox.linalg.eig (abalkin)
+ * Started some support for Python3 (abalkin)
+   setup.py support python3 now.
+   It call 2to3 during the setup.
+   Python3 not fully supported as we didn't update the c code.
+
+
+Crash Fix:
+ * Fix a crash related to scan.grad due to the new mechanism. (Ian G.)
+ * Fix an optimization warning. Now it get optimized. (Frederic B.)
+ * Fix crash introduced in 0.6rc1 in theano.grad (Ian G.)
+ * Fix crash introduced in 0.6rc1 in the grad of scan (Razvan P.)
+ * Fix crash introduced in 0.6rc1 in the grad of clip (Ian G.)
+   Also implement the gradient on the min/max bound.
+ * Fix crash in the grad of tensor.switch for int (Ian G.)
+ * Fix crash when mixing shared variable on the GPU and sparse dot. (Pascal L.)
+ * Fix crash as sometimes sparse.dot would return a different dtype number
+   that is equivalent but not the one expected. (Pascal L., reported by Rami Al-Rfou)
+ * Better error msg (Ian G.)
+ * Move all sparse random function back to sandbox as it don't have a state inside Theano. (Pascal L.)
+   They where moved outside the sandbox in 0.6rc1
+ * LoadFromDisk now is allowed to take only support some memmap mode. (Pascal L.)
+   Otherwise, this was causing errors, segmentation faults or wrong results.
+ * Fix import problem on PiCloud (Jeremiah Lowin)
+    * You need to use the c|py linker with the default
+      environment. Otherwise, you need to create your own environment.
+ * Fix a crash during optimization when we take a subtensor of a constant with a non constant index. (Ian G.)
+ * Better handling and error message of gradients on integer. (Ian G.)
+ * Fixes a crash where Scan assumed all TypeErrors raised by the grad function were due to undefined gradients (Ian G.)
+
+Other:
+ * Doc typo fixes, Doc updates, Better error messages: Olivier D., David W.F., Frederic B., James B., Matthew Rocklin, Ian G., abalkin.
 
 =============
 Release Notes