[GitHub] [tvm] anwang2009 commented on a change in pull request #10089: [Relay][Pass] Add a relay pass to extract fake quantized ops

[GitBox <gi...@apache.org>]

anwang2009 commented on a change in pull request #10089:
URL: https://github.com/apache/tvm/pull/10089#discussion_r794938851



##########
File path: src/relay/analysis/extract_fake_quantized_ops.cc
##########
@@ -0,0 +1,108 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/*!
+ * \file extract_fake_quantized_ops.cc
+ * \brief Extract fake quantized operators from an IRModule
+ */
+#include <tvm/relay/expr.h>
+#include <tvm/relay/expr_functor.h>
+
+namespace tvm {
+namespace relay {
+
+using ExprSet = std::unordered_set<Expr, ObjectPtrHash, ObjectPtrEqual>;
+
+class FakeQuantizedRegionExtractor : public ExprVisitor {
+ public:
+  const ExprSet GetRegion(const Expr& expr) {
+    VisitExpr(expr);
+    ExprSet region;
+    for (auto kv : this->visit_counter_) {
+      if (auto call_node = GetRef<ObjectRef>(kv.first).as<CallNode>()) {
+        if (call_node->op != quantize_op_ && call_node->op != dequantize_op_) {
+          region.insert(Downcast<Expr>(GetRef<ObjectRef>(kv.first)));
+        }
+      }
+    }
+    return region;
+  }
+
+ protected:
+  void VisitExpr_(const CallNode* call_node) override {
+    if (call_node->op == quantize_op_) {
+      // only look at arg0 for quantize
+      VisitExpr(call_node->args[0]);
+    } else if (call_node->op != dequantize_op_) {
+      // run normally on everything else.
+      ExprVisitor::VisitExpr_(call_node);
+    }
+  }
+
+  const Op quantize_op_ = Op::Get("qnn.quantize");
+  const Op dequantize_op_ = Op::Get("qnn.dequantize");
+};
+
+class ExtractFakeQuantizedOpsWrapper : private MixedModeVisitor {
+ public:
+  explicit ExtractFakeQuantizedOpsWrapper(const IRModule& mod) : mod_(mod) {}
+
+  Map<String, tvm::Integer> Extract() {
+    VisitExpr(this->mod_->Lookup("main"));
+
+    return fake_quantized_op_freqs_;
+  }
+
+ private:
+  using MixedModeVisitor::VisitExpr_;
+
+  const IRModule mod_;
+  /*! \brief Dict of fake quantized op names to frequency counts */
+  Map<String, tvm::Integer> fake_quantized_op_freqs_;
+
+  void VisitExpr_(const CallNode* call_node) override {
+    if (call_node->op == quantize_op_) {
+      FakeQuantizedRegionExtractor extractor;
+      ExprSet region = extractor.GetRegion(GetRef<Expr>(call_node));
+
+      for (auto expr : region) {
+        const Op op = Downcast<Op>(expr.as<CallNode>()->op);
+        auto op_name = op->name;
+        if (fake_quantized_op_freqs_.find(op_name) != fake_quantized_op_freqs_.end()) {
+          fake_quantized_op_freqs_.Set(op_name, 1 + fake_quantized_op_freqs_.at(op_name));
+        } else {
+          fake_quantized_op_freqs_.Set(op_name, 1);
+        }
+      }
+    }
+  }
+
+  const Op quantize_op_ = Op::Get("qnn.quantize");
+  const Op dequantize_op_ = Op::Get("qnn.dequantize");

Review comment:
       nit: looks like this dequantize is unused




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