fix edge cost exceeds int range error
Merge branch 'master' of github.com:spartan-array/spartan
fix tiled expr reuse error
remove cost_hint in lda
Merge pull request #205 from MaggieQi/master

fix edge cost exceeds int range error
Merge pull request #209 from rgardner/add-and-or-operators

#208 Add logical operations to Expr
Merge pull request #207 from GabrielWen/newaxis

Enhancement: Newaxis
Merge github.com:spartan-array/spartan