Introduce centralised name transformation functions

To address some of the concerns raised in #8280 and #8720 I've put together a series of functions to combine together names to re-use between these areas. These are meant to be a starting point to fix up the name generation to use the TVM C conventions and port the interface API header to C++.

These functions will also be used for constructing the names in the C Device API (apache/tvm-rfcs#31).

python/tvm/relay/backend/name_transforms.py

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+# 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.
+"""
+Name transformation functions for use in code generation
+"""
+
+from typing import List, Union
+
+from . import _backend
+
+
+def to_c_function_style(original_name: str):
+    """Transform a name to the C function style assuming it is
+    appropriately constructed using the prefixing functions
+
+    Parameters
+    ----------
+    original_name : str
+        Original name to transform
+    """
+    return _backend.ToCFunctionStyle(original_name)
+
+
+def to_c_variable_style(original_name: str):
+    """Transform a name to the C variable style assuming it is
+    appropriately constructed using the prefixing functions
+
+    Parameters
+    ----------
+    original_name : str
+        Original name to transform
+    """
+    return _backend.ToCVariableStyle(original_name)
+
+
+def prefix_name(names: Union[List[str], str]):
+    """Apply TVM-specific prefix to a function name
+
+    Parameters
+    ----------
+    names : Union[List[str], str]
+        List of names to combine to form a combined name or the name itself
+    """
+    if isinstance(names, str):
+        names = [names]
+
+    return _backend.PrefixName(names)
+
+
+def prefix_generated_name(names: Union[List[str], str]):
+    """Apply generated TVM-specific prefix to a function name
+
+    Parameters
+    ----------
+    names : Union[List[str], str]
+        List of names to combine to form a combined name or the name itself
+    """
+    if isinstance(names, str):
+        names = [names]
+
+    return _backend.PrefixGeneratedName(names)
+
+
+def sanitise_name(original_name: str):
+    """Sanitise name for output into compiler artifacts
+
+    Parameters
+    ----------
+    original_name : str
+        Original name to sanitise
+    """
+    return _backend.SanitiseName(original_name)

src/relay/backend/name_transforms.cc

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+/*
+ * 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.
+ */
+
+#include "name_transforms.h"
+
+#include <tvm/runtime/registry.h>
+
+#include <string>
+
+namespace tvm {
+namespace relay {
+namespace backend {
+
+std::string ToCFunctionStyle(const std::string& original_name) {
+  ICHECK(!original_name.empty());
+
+  int tvm_prefix_length = 3;
+  std::string function_name("TVM");
+
+  bool new_block = true;
+  for (const char& symbol : original_name.substr(tvm_prefix_length)) {
+    if (std::isalpha(symbol)) {
+      if (new_block) {
+        function_name.push_back(std::toupper(symbol));
+        new_block = false;
+      } else {
+        function_name.push_back(std::tolower(symbol));
+      }
+    } else if (symbol == '_') {
+      new_block = true;
+    }
+  }
+  return function_name;
+}
+
+std::string ToCVariableStyle(const std::string& original_name) {
+  ICHECK(!original_name.empty());
+
+  std::string variable_name;
+  variable_name.resize(original_name.size());
+
+  std::transform(original_name.begin(), original_name.end(), variable_name.begin(), ::tolower);
+  return variable_name;
+}
+
+std::string CombineNames(const Array<String>& names) {
+  std::stringstream combine_stream;
+  ICHECK(!names.empty());
+
+  for (const String& name : names) {
+    ICHECK(!name.empty());
+    combine_stream << name << "_";
+  }
+
+  std::string combined_name = combine_stream.str();
+  combined_name.pop_back();
+  return combined_name;
+}
+
+std::string SanitiseName(const std::string& name) {
+  ICHECK(!name.empty());
+
+  auto multipleSeparators = [](char before, char after) {
+    return before == '_' && before == after;
+  };
+  auto isNotAlnum = [](char c) { return !std::isalnum(c); };
+  std::string sanitised_input = name;
+  std::replace_if(sanitised_input.begin(), sanitised_input.end(), isNotAlnum, '_');
+
+  sanitised_input.erase(
+      std::unique(sanitised_input.begin(), sanitised_input.end(), multipleSeparators),
+      sanitised_input.end());
+
+  return sanitised_input;
+}
+
+TVM_REGISTER_GLOBAL("relay.backend.ToCFunctionStyle").set_body_typed(ToCFunctionStyle);
+TVM_REGISTER_GLOBAL("relay.backend.ToCVariableStyle").set_body_typed(ToCVariableStyle);
+TVM_REGISTER_GLOBAL("relay.backend.PrefixName").set_body_typed(PrefixName);
+TVM_REGISTER_GLOBAL("relay.backend.PrefixGeneratedName").set_body_typed(PrefixGeneratedName);
+TVM_REGISTER_GLOBAL("relay.backend.SanitiseName").set_body_typed(SanitiseName);
+
+}  // namespace backend
+}  // namespace relay
+}  // namespace tvm

src/relay/backend/name_transforms.h

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+/*
+ * 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 relay/backend/name_transforms.h
+ * \brief Transformations which are applied on names to generate appropriately named compiler
+ * artifacts
+ *
+ * Example:
+ * ToCFunctionStyle(PrefixName(CombineNames({"Device", "target", "Invoke"})))
+ * // TVMDeviceTargetInvoke
+ *
+ * ToCFunctionStyle(PrefixGeneratedName(CombineNames({"model", "Run"})))
+ * // TVMGenModelRun
+ *
+ * ToCVariableStyle(PrefixName(CombineNames({"Device", "target", "t"})))
+ * // tvm_device_target_t
+ *
+ * ToCVariableStyle(PrefixGeneratedName(CombineNames({"model", "Devices"})))
+ * // tvmgen_model_devices
+ *
+ */
+
+#include <tvm/runtime/container/array.h>
+#include <tvm/runtime/container/string.h>
+#include <tvm/runtime/logging.h>
+
+#include <algorithm>
+#include <iostream>
+#include <string>
+
+#ifndef TVM_RELAY_BACKEND_NAME_TRANSFORMS_H_
+#define TVM_RELAY_BACKEND_NAME_TRANSFORMS_H_
+
+namespace tvm {
+namespace relay {
+namespace backend {
+
+/*!
+ * \brief Transform a name to the C variable style assuming it is
+ * appropriately constructed using the prefixing functions
+ * \param original_name Original name
+ * \return Transformed function in the C function style
+ */
+std::string ToCFunctionStyle(const std::string& original_name);
+
+/*!
+ * \brief Transform a name to the C variable style assuming it is
+ * appropriately constructed using the prefixing functions
+ * \param name Original name
+ * \return Transformed function in the C variable style
+ */
+std::string ToCVariableStyle(const std::string& original_name);
+
+/*!
+ * \brief Combine names together for use as a generated name
+ * \param names Vector of strings to combine
+ * \return Combined together names
+ */
+std::string CombineNames(const Array<String>& names);
+
+/*!
+ * \brief Apply TVM-specific prefix to a name
+ * \param names Vector of names to combine to form a combined name
+ * \return Name with prefix applied or prefix-only if no name passed
+ */
+inline std::string PrefixName(const Array<String>& names) { return "TVM_" + CombineNames(names); }
+
+/*!
+ * \brief Apply generated TVM-specific prefix to a name
+ * \param names Vector of names to combine to form a combined name
+ * \return Name with prefix applied or prefix-only if no name passed
+ */
+inline std::string PrefixGeneratedName(const Array<String>& names) {
+  return "TVMGen_" + CombineNames(names);
+}
+
+/*!
+ * \brief Sanitise name for output into compiler artifacts
+ * \param name Original name
+ * \return Sanitised name
+ */
+std::string SanitiseName(const std::string& name);
+
+}  // namespace backend
+}  // namespace relay
+}  // namespace tvm
+
+#endif  // TVM_RELAY_BACKEND_NAME_TRANSFORMS_H_

tests/cpp/name_transforms_test.cc

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+/*
+ * 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.
+ */
+
+#include "../src/relay/backend/name_transforms.h"
+
+#include <gtest/gtest.h>
+#include <tvm/runtime/container/string.h>
+
+using namespace tvm::relay::backend;
+using namespace tvm::runtime;
+
+TEST(NameTransforms, ToCFunctionStyle) {
+  ASSERT_EQ(ToCFunctionStyle("TVM_Woof"), "TVMWoof");
+  ASSERT_EQ(ToCFunctionStyle("TVM_woof"), "TVMWoof");
+  ASSERT_EQ(ToCFunctionStyle("TVM_woof_woof"), "TVMWoofWoof");
+  ASSERT_EQ(ToCFunctionStyle("TVMGen_woof_woof"), "TVMGenWoofWoof");
+  EXPECT_THROW(ToCFunctionStyle(""), InternalError);
+}
+
+TEST(NameTransforms, ToCVariableStyle) {
+  ASSERT_EQ(ToCVariableStyle("TVM_Woof"), "tvm_woof");
+  ASSERT_EQ(ToCVariableStyle("TVM_woof"), "tvm_woof");
+  ASSERT_EQ(ToCVariableStyle("TVM_woof_Woof"), "tvm_woof_woof");
+  EXPECT_THROW(ToCVariableStyle(""), InternalError);
+}
+
+TEST(NameTransforms, PrefixName) {
+  ASSERT_EQ(PrefixName({"Woof"}), "TVM_Woof");
+  ASSERT_EQ(PrefixName({"woof"}), "TVM_woof");
+  ASSERT_EQ(PrefixName({"woof", "moo"}), "TVM_woof_moo");
+  EXPECT_THROW(PrefixName({}), InternalError);
+  EXPECT_THROW(PrefixName({""}), InternalError);
+}
+
+TEST(NameTransforms, PrefixGeneratedName) {
+  ASSERT_EQ(PrefixGeneratedName({"Woof"}), "TVMGen_Woof");
+  ASSERT_EQ(PrefixGeneratedName({"woof"}), "TVMGen_woof");
+  ASSERT_EQ(PrefixGeneratedName({"woof", "moo"}), "TVMGen_woof_moo");
+  EXPECT_THROW(PrefixGeneratedName({}), InternalError);
+  EXPECT_THROW(PrefixGeneratedName({""}), InternalError);
+}
+
+TEST(NameTransforms, CombineNames) {
+  ASSERT_EQ(CombineNames({"woof"}), "woof");
+  ASSERT_EQ(CombineNames({"Woof", "woof"}), "Woof_woof");
+  ASSERT_EQ(CombineNames({"Woof", "woof", "woof"}), "Woof_woof_woof");
+  ASSERT_EQ(CombineNames({"Woof", "moo", "t"}), "Woof_moo_t");
+
+  EXPECT_THROW(CombineNames({}), InternalError);
+  EXPECT_THROW(CombineNames({""}), InternalError);
+  EXPECT_THROW(CombineNames({"Woof", ""}), InternalError);
+  EXPECT_THROW(CombineNames({"", "Woof"}), InternalError);
+}
+
+TEST(NameTransforms, SanitiseName) {
+  ASSERT_EQ(SanitiseName("+_+ "), "_");
+  ASSERT_EQ(SanitiseName("input+"), "input_");
+  ASSERT_EQ(SanitiseName("input-"), "input_");
+  ASSERT_EQ(SanitiseName("input++"), "input_");
+  ASSERT_EQ(SanitiseName("woof:1"), "woof_1");
+  EXPECT_THROW(SanitiseName(""), InternalError);
+}
+
+TEST(NameTransforms, CombinedLogic) {
+  ASSERT_EQ(ToCFunctionStyle(PrefixName({"Device", "target", "Invoke"})), "TVMDeviceTargetInvoke");
+  ASSERT_EQ(ToCFunctionStyle(PrefixGeneratedName({"model", "Run"})), "TVMGenModelRun");
+  ASSERT_EQ(ToCVariableStyle(PrefixName({"Device", "target", "t"})), "tvm_device_target_t");
+  ASSERT_EQ(ToCVariableStyle(PrefixGeneratedName({"model", "Devices"})), "tvmgen_model_devices");
+}