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[Relay] clean up hd, change tl #2917

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Merged
tqchen merged 1 commit into from
Mar 27, 2019
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[Relay] clean up hd, change tl #2917

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4 changes: 1 addition & 3 deletions python/tvm/relay/prelude.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,6 @@ def define_list_hd(self):
x = Var("x", self.l(a))
y = Var("y")
z = Var("z")
# Don't match nil() since it will break type checking
cons_case = Clause(PatternConstructor(self.cons, [PatternVar(y), PatternVar(z)]), y)
self.mod[self.hd] = Function([x], Match(x, [cons_case]), a, [a])

Expand All @@ -43,9 +42,8 @@ def define_list_tl(self):
x = Var("x", self.l(a))
y = Var("y")
z = Var("z")
nil_case = Clause(PatternConstructor(self.nil, []), self.nil())
cons_case = Clause(PatternConstructor(self.cons, [PatternVar(y), PatternVar(z)]), z)
self.mod[self.tl] = Function([x], Match(x, [nil_case, cons_case]), self.l(a), [a])
self.mod[self.tl] = Function([x], Match(x, [cons_case]), self.l(a), [a])

def define_list_nth(self):
"""Defines a function to get the nth element of a list.
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