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

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MargaretQian commented on a change in pull request #10089:
URL: https://github.com/apache/tvm/pull/10089#discussion_r797012395



##########
File path: src/relay/analysis/extract_fake_quantized_ops.cc
##########
@@ -0,0 +1,82 @@
+/*
+ * 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>
+#include <tvm/relay/transform.h>
+
+#include "../transforms/fake_quantization_to_integer.h"
+
+namespace tvm {
+namespace relay {
+
+using ExprSet = std::unordered_set<Expr, ObjectPtrHash, ObjectPtrEqual>;
+
+class ExtractFakeQuantizedOpsWrapper : private MixedModeVisitor {
+ public:
+  Map<String, tvm::Integer> Extract(const IRModule& m) {
+    IRModule mod(m);
+    mod = transform::InferType()(mod);
+    VisitExpr(mod->Lookup("main"));
+
+    return fake_quantized_op_freqs_;
+  }
+
+ private:
+  using MixedModeVisitor::VisitExpr_;
+  /*! \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_) {
+      SubgraphExtractor extractor;
+      ExprSet subgraph = extractor.GetSubgraph(GetRef<Expr>(call_node));
+
+      for (auto expr : subgraph) {
+        const Op op = Downcast<Op>(expr.as<CallNode>()->op);
+        auto op_name = op->name;
+        if (op != dequantize_op_) {
+          if (fake_quantized_op_freqs_.find(op_name) != fake_quantized_op_freqs_.end()) {
+            fake_quantized_op_freqs_.Set(op_name,
+                                         int64_t(fake_quantized_op_freqs_.at(op_name)) + 1);

Review comment:
       i was getting compile-time errors that `fake_quantized_op_freqs_.at(op_name) + 1` is a `PrimExpr` instead of a `tvm::Integer` and it seemed like casting worked around the issue -- lmk if there's a better way around this?




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