ó àÆ÷Xc @`sªdZddlmZmZmZddlmZddlmZddl Z ddl Z ddl Z ddl m Z ddl mZddlmZmZdd lmZdd lmZdd lmZdd l mZdd lmZddlmZdZdZdZdZe j dƒZ!defd„ƒYZ"dd„Z$ej%e"gƒd„ƒZ&ej'dej(e&de)ƒdddƒe j*j+j,e j*j+j-e j*j+j.e j*j/e j*j+j0e j*j1e j*j2e j*j+j3e j*j+j4e j*j5j6e j*j5j7f Z8ej%e8ƒd„ƒZ9ej%e"gƒd„ƒZ:ej%e"gƒd„ƒZ;d ej<fd!„ƒYZ=ej%e"gƒd"„ƒZ>ej%e"gƒd#„ƒZ?dS($sR IfElse introduces lazy evaluation in Theano (coupled with the CVM/VM linkers). It resembles the if clause of any programming language, that has a `then` and `else` branch, and executes either one or the other according to the condition provided. This op differs from the already existent `switch` op, that evaluates both branches of the clause and afterwards picks (according to the condition) which value to report. Note also that `switch` is an elemwise operation (so it picks each entry of a matrix according to the condition) while `ifelse` is a global operation with a scalar condition. i(tabsolute_importtprint_functiontdivision(tdeepcopy(tizipN(t TensorType(tgof(tOptApply(t iteritems(txrange(toptdb(topt(tfind_up(tclonesrestructedtext ens>Razvan Pascanu James Bergstra Dumitru Erhan David Warde-Farleys (c) 2010, Universite de Montreals Razvan Pascanu s theano.ifelsetIfElsecB`skeZdZeed d„Zd„Zd„Zd„Zd„Z d„Z d„Z d„Z d d „Z RS( st Op that provides conditional graph evaluation if used with the CVM/VM linkers. Note that there exist a helpful function `ifelse` that should be used to instantiate the op! According to a scalar condition `condition` the op evaluates and then returns all the tensors provided on the `then` branch, otherwise it evaluates and returns the tensors provided on the `else` branch. The op supports multiple tensors on each branch, with the condition that the same number of tensors are on the `then` as on the `else` and there is a one to one correspondence between them (shape and dtype wise). The `then` branch is defined as the first N tensors (after the condition), while the `else` branch is defined as the last N tensors. Example usage: ``rval = ifelse(condition, rval_if_true1, .., rval_if_trueN, rval_if_false1, rval_if_false2, .., rval_if_falseN)`` :note: Other Linkers then CVM and VM are INCOMPATIBLE with this Op, and will ignore its lazy characteristic, computing both the True and False branch before picking one. cC`sh|r@i}x%t|ƒD]}|dg|| ifelse(c, op(x), op(y)) if `op` is in the `acceptable_ops` list, and there is no other if as input to that specific `op`, and the if has no other clients !? iiR)(R*R„tacceptable_opsRtsetR/taddtownerR+RR-RR1tindexR#R0RRƒ(t main_nodet all_inp_nodestinpRJtifnodesR3R„RKRLtmopttrue_inst false_insRt true_evalt false_evaltnw_outs((s-/tmp/pip-build-X4mzal/theano/theano/ifelse.pyt,ifelse_lift_single_if_through_acceptable_ops×s6  $    c C`s7|j}t|tƒstS|jd|j }i}xœt|ƒD]Ž\}}|jrCt|jjtƒrC|jjd|jdkrC|jj}|jjd|j }||jjj |ƒ||d|j}t|tƒstS|jd|j}i}x£t|ƒD]•\}}|jrCt|jjtƒrC|jjd|jdkrC|jj}|jjd|j}||jjj |ƒ||d|j sT   ø p$          023