ó Xtj||||ƒ|dkr1tdƒ‚n||_dS(sMInitialize the tournament selector. Arguments: o num_competitors-- The number of individiuals that should be involved in a selection round. By default we just have two individuals (head to head!). See AbstractSelection for a description of the arguments to the initializer. is!Must have at least 2 competitors!N(Rt__init__t ValueErrort_num_competitors(tselftmutatort crossovertrepairertnum_competitors((sŽ/oak/stanford/groups/akundaje/marinovg/programs/biopython-1.50.tar.gz/biopython-1.50/build/lib.linux-x86_64-2.7/Bio/GA/Selection/Tournament.pyRs  cCst|j|jƒS(s{Comparison function for comparing two organisms. This just allows us to easily sort organisms by fitness. (tcmptfitness(Rtorg_1torg_2((sŽ/oak/stanford/groups/akundaje/marinovg/programs/biopython-1.50.tar.gz/biopython-1.50/build/lib.linux-x86_64-2.7/Bio/GA/Selection/Tournament.pyt _fitness_cmp$sc Csg}xøt|ƒt|ƒkrg}x‚tdƒD]t}g}xDt|ƒ|jkr†tj|ƒ}||krC|j|ƒqCqCW|j|jƒ|j|dƒq4Wt|ƒdksĘtdƒ‚|j |d|dƒ\}}|j ||gƒq W|S(s=Perform selection on the population using the Tournament model. Arguments: o population -- A population of organisms on which we will perform selection. The individuals are assumed to have fitness values which are due to their current genome (ie. the fitness is up to date). iiĸĸĸĸs%Expected two organisms to be selectedii( tlentrangeRtrandomtchoicetappendtsortRtAssertionErrortmutate_and_crossovertextend( Rt populationtnew_populationtnew_orgst round_numt competitorstnew_orgt new_org_1t new_org_2((sŽ/oak/stanford/groups/akundaje/marinovg/programs/biopython-1.50.tar.gz/biopython-1.50/build/lib.linux-x86_64-2.7/Bio/GA/Selection/Tournament.pytselect+s   (t__name__t __module__t__doc__RRR (((sŽ/oak/stanford/groups/akundaje/marinovg/programs/biopython-1.50.tar.gz/biopython-1.50/build/lib.linux-x86_64-2.7/Bio/GA/Selection/Tournament.pyRs  (R#RtAbstractRR(((sŽ/oak/stanford/groups/akundaje/marinovg/programs/biopython-1.50.tar.gz/biopython-1.50/build/lib.linux-x86_64-2.7/Bio/GA/Selection/Tournament.pyts