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[Relay][Training] Add missing gradient check to gradient pass #4169

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Oct 22, 2019
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[Relay][Training] Add missing gradient check to gradient pass #4169

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31 changes: 29 additions & 2 deletions src/relay/pass/gradient.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -351,8 +351,6 @@ struct ReverseAD : ExprMutator {
Expr VisitExpr_(const CallNode* op) final {
if (const OpNode* op_node = op->op.as<OpNode>()) {
Op op_ref = GetRef<Op>(op_node);
CHECK(rev_map.count(op_ref))
<< op_node->name << " does not have reverse mode defined";
return LetList::With([&](LetList* ll) {
std::vector<Var> args;
for (const auto& arg : op->args) {
Expand Down Expand Up @@ -408,6 +406,34 @@ Expr BPEmpty() {
return RefCreateNode::make(unitF);
}

bool MissingGrad(const Expr& e) {
struct MGVisitor : ExprVisitor {
const OpMap<FPrimalGradient> rev_map = Op::GetAttr<FPrimalGradient>("FPrimalGradient");
std::unordered_set<std::string> op_names;

void VisitExpr_(const OpNode* op) final {
Op op_ref = GetRef<Op>(op);
if (!rev_map.count(op_ref)) {
op_names.insert(op_ref->name);
}
ExprVisitor::VisitExpr_(op);
}
};

MGVisitor mg;
mg.VisitExpr(e);

if (mg.op_names.size() > 0) {
LOG(WARNING) << "found operators with missing gradients:";
for (const auto& op : mg.op_names) {
LOG(WARNING) << " " << op;
}
return true;
}

return false;
}

Expr Gradient(const Expr& re, const Module& mod) {
auto e = DeGlobal(mod, re);
auto f = e.as<FunctionNode>();
Expand All @@ -416,6 +442,7 @@ Expr Gradient(const Expr& re, const Module& mod) {
for (const auto& p : f->params) {
CHECK(p->checked_type().as<TensorTypeNode>()) << "input parameters need to be tensor";
}
CHECK(!MissingGrad(e)) << "input has operators with missing gradients";
Expr body = LetList::With([&](LetList* ll) {
Var bp = ll->Push(BPEmpty());
Expr rev = ReverseAD(bp)(e);
Expand Down