10 合并请求!11636[IMPORTANT] MKLDNN layout: Support for sum operator,!8482Release/0.11.0,!8190Release/0.11.0,!8189Release/0.11.0,!6633给线性回归的get-started代码加上了预测的示例~~,!4615Feature/tensor array add python binding,!4088Cond_op with dynamic if-else checked-in,!3973USED FOR TRIGGER CI, DO NOT MERGE,!3895Tensor support Element size,!3838cond op