我正在使用igrigoriks decisiontree gem并从数据库条目创建训练集，如下所示：
attributes = [ 'day', 'time' ]
trainingSet = []
if self.locations.count > 0
self.locations.each{ |location|
entry = Array.new(3)
day = location.created_at.strftime('%u').to_i
time_category = (location.created_at.hour / 8).floor.to_i
entry = [ day, time_category, location.longitude ]
trainingSet.push(entry)
}
end
然后创建一个这样的决策树：
decisionTree = DecisionTree::ID3Tree.new(attributes, trainingSet, 1, :discrete)
然后我尝试创建一个测试集并测试预测，如下所示：
test = [ 5, 1, 10]
decision = decisionTree.predict(test)
但是当我尝试这个时，我就得到了
undefined method `to_a' for 9.9907190386056:Float
有没有人知道我可能做错了什么或者能指出我正确的方向？
更新1
事实证明我的数据不适合测试，因为如果训练集中的所有条目都具有相同的属性值，它将无法工作。
对于只有目标特征变化的属性，我的测试都是[5,1]。
我知道我的很多数据看起来都是这样的，属性值相等，那么处理这个错误的方法是什么呢？
更新2
根据要求，这是回溯。
/Users/kasper/.rvm/gems/ruby-2.0.0-p247/bundler/gems/decisiontree-4da9dcf68eb0/lib/decisiontree/id3_tree.rb:166:in
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/Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:950:inblock (2 levels) in route!' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:987:in块in process_route' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:985:incatch' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:985:inprocess_route' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:948:inblock in route!' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:947:ineach' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:947:inroute!' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:1059:in阻止派遣！' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:1041:inblock in invoke' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:1041:incatch' 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/Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/rack-protection-1.5.0/lib/rack/protection/json_csrf.rb:18:incall' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/rack-protection-1.5.0/lib/rack/protection/base.rb:49:incall' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/rack-protection-1.5.0/lib/rack/protection/base.rb:49:incall' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/rack-protection-1.5.0/lib/rack/protection/frame_options.rb:31:incall' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/rack-1.5.2/lib/rack/nulllogger.rb:9:incall' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/rack-1.5.2/lib/rack/head.rb:11:incall' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:175:incall' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/sinatra-1.4.3/lib/sinatra/base.rb:1949:incall' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/passenger-4.0.19/lib/phusion_passenger/rack/thread_handler_extension.rb:77:inprocess_request' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/passenger-4.0.19/lib/phusion_passenger/request_handler/thread_handler.rb:140:inaccept_and_process_next_request' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/passenger-4.0.19/lib/phusion_passenger/request_handler/thread_handler.rb:108:inmain_loop' /Users/kasper/.rvm/gems/ruby-2.0.0-p247/gems/passenger-4.0.19/lib/phusion_passenger/request_handler.rb:441:in阻止（3级） start_threads'
更新3 我在Github repo here上创建了一个问题，其中讨论了如何处理问题。但据我所知，基于此讨论，宝石永远不会有任何变化。