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[Relay]Disable InferType if it was done and no changes after previous pass #17585

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[Relay]Disable InferType if it was done and no changes after previous pass #17585

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22 changes: 15 additions & 7 deletions src/relay/ir/dataflow_matcher.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -851,24 +851,32 @@ Expr PatternRewriter::Rewrite(const Array<DFPatternCallback>& callbacks, const E
std::unordered_map<DFPatternCallback, bool, ObjectPtrHash, ObjectPtrEqual> done;
do {
last = post;
// We don't have to call InferType if previous pass has not modified anything
// We can just take previous typed state of the expression
bool types_invalidated = true;
for (auto callback : callbacks) {
if (!done[callback]) {
auto before = post;
auto post_typed = post;
callback_ = callback;
if (callback_->require_type) {
post = InferTypeWithModule(post, mod_);
if (callback_->require_type && types_invalidated) {
post_typed = InferTypeWithModule(post, mod_);
}
auto grouper = PatternGrouper();
groups_ = grouper.GroupMatches(callback_->pattern, post);
groups_ = grouper.GroupMatches(callback_->pattern, post_typed);
gid_assignments_ = grouper.GetGIDAssignments();
memo_.clear();
VLOG(1) << "pre rewritten:" << std::endl << PrettyPrint(pre);
post = this->VisitExpr(post);
post = this->VisitExpr(post_typed);
VLOG(1) << "post rewritten:" << std::endl << PrettyPrint(post);
count++;
if (callback_->rewrite_once) {
bool current_equal = (*structural_equal)(before, post, false, true);
if (!current_equal) {
bool current_equal = (*structural_equal)(before, post, false, true);
if (callback_->require_type && current_equal) {
types_invalidated = false;
post = post_typed;
} else {
types_invalidated = true;
if (callback_->rewrite_once) {
done[callback] = true;
}
}
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