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/*
SPDX-FileCopyrightText: Copyright 2022, Arm Limited and/or its affiliates.
SPDX-License-Identifier: Apache-2.0
*/
#include "tosa_checker.h"
#include "absl/strings/string_view.h"
#include "llvm/Support/MemoryBuffer.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/IR/Attributes.h"
#include "mlir/IR/BuiltinOps.h"
#include "mlir/IR/Location.h"
#include "mlir/IR/Operation.h"
#include "mlir/IR/Types.h"
#include "mlir/IR/Verifier.h"
#include "mlir/Pass/PassManager.h"
#include "mlir/Support/FileUtilities.h"
#include "tensorflow/compiler/mlir/lite/flatbuffer_import.h"
#include "tensorflow/compiler/mlir/tosa/tfl_passes.h"
#include <map>
#include <memory>
#include <optional>
#include <stdexcept>
#include <string>
#include <unordered_set>
#include <vector>
namespace std {
template <>
struct hash<mlir::Location> {
std::size_t operator()(const mlir::Location &loc) const {
return mlir::hash_value(loc);
}
};
} // namespace std
namespace tosa_checker {
TOSAChecker::TOSAChecker(const std::string &model_path) {
m_model = TFLiteFileToMLIR(model_path, &m_context);
m_tosa_model = m_model->clone();
LegalizeTFLToTOSA(*m_tosa_model);
}
bool TOSAChecker::IsTOSACompatible() {
bool is_tosa_compatible = true;
for (auto func : m_tosa_model->getOps<mlir::func::FuncOp>()) {
func.walk([&](mlir::Operation *op) {
// Ignore func namespace
const mlir::Dialect *dialect = op->getDialect();
if (!dialect || (!dialect->getNamespace().equals("tosa") &&
!dialect->getNamespace().equals("func"))) {
is_tosa_compatible = false;
return mlir::WalkResult::interrupt();
}
return mlir::WalkResult::advance();
});
}
return is_tosa_compatible;
}
std::vector<TOSAChecker::Operator> TOSAChecker::GetTOSACompatibilityForOps(
bool elide_large_attrs) {
// Get the locations of all the ops in the legalized model that were not
// converted during the TOSA legalization (i.e. the TOSA incompatible ones).
std::unordered_set<mlir::Location> tosa_incompatible_locs;
for (auto func : m_tosa_model->getOps<mlir::func::FuncOp>()) {
func.walk([&](mlir::Operation *op) {
// Ignore func namespace
const mlir::Dialect *dialect = op->getDialect();
if (!dialect || (!dialect->getNamespace().equals("tosa") &&
!dialect->getNamespace().equals("func"))) {
tosa_incompatible_locs.insert(op->getLoc());
}
});
}
// We assume that on legalization, the non-legalized ops keep their original
// location. If an op location from the original model is in
// tosa_incompatible_locs then the op is not tosa compatible, otherwise it is.
std::vector<Operator> ops;
for (auto func : m_model->getOps<mlir::func::FuncOp>()) {
func.walk([&](mlir::Operation *op) {
// Ignore func namespace
const mlir::Dialect *dialect = op->getDialect();
if (!dialect || !dialect->getNamespace().equals("func")) {
const bool is_tosa_compatible =
tosa_incompatible_locs.find(op->getLoc()) ==
tosa_incompatible_locs.end();
ops.push_back(ToOperator(*op, is_tosa_compatible, elide_large_attrs));
}
});
}
return ops;
}
std::vector<TOSAChecker::Operator> TOSAChecker::GetUsedTOSAOps(
bool elide_large_attrs) {
std::vector<Operator> tosa_ops;
for (mlir::Operation *op : GetTOSAOps(*m_tosa_model)) {
const bool is_tosa_compatible = true;
tosa_ops.push_back(ToOperator(*op, is_tosa_compatible, elide_large_attrs));
}
return tosa_ops;
}
std::string TOSAChecker::GetMLIRModelRepresentation(bool elide_large_attrs) {
return GetMLIRRepresentation(*m_model, elide_large_attrs);
}
std::string TOSAChecker::GetMLIRTOSAModelRepresentation(
bool elide_large_attrs) {
return GetMLIRRepresentation(*m_tosa_model, elide_large_attrs);
}
template <typename T>
std::string TOSAChecker::GetMLIRRepresentation(T &&op) {
std::string value;
llvm::raw_string_ostream value_ostream(value);
op.print(value_ostream);
return value;
}
template <typename T>
std::string TOSAChecker::GetMLIRRepresentation(T &&op, bool elide_large_attrs) {
std::string value;
llvm::raw_string_ostream value_ostream(value);
mlir::OpPrintingFlags flags;
if (elide_large_attrs) {
flags.elideLargeElementsAttrs(ELIDE_LARGE_ATTRS_LIMIT);
}
op.print(value_ostream, flags);
return value;
}
std::vector<mlir::Operation *> TOSAChecker::GetTOSAOps(mlir::ModuleOp model) {
std::vector<mlir::Operation *> tosa_ops;
for (auto func : model.getOps<mlir::func::FuncOp>()) {
func.walk([&](mlir::Operation *op) {
const mlir::Dialect *dialect = op->getDialect();
if (dialect && dialect->getNamespace().equals("tosa")) {
tosa_ops.push_back(op);
}
});
}
return tosa_ops;
}
TOSAChecker::Operator TOSAChecker::ToOperator(mlir::Operation &op,
bool is_tosa_compatible,
bool elide_large_attrs) {
return Operator(op.getName().getStringRef().str(),
GetMLIRRepresentation(op.getLoc()),
GetAttributes(op, elide_large_attrs), is_tosa_compatible,
GetMLIRRepresentation(op, elide_large_attrs));
}
mlir::OwningOpRef<mlir::ModuleOp> TOSAChecker::TFLiteFileToMLIR(
const std::string &model_path, mlir::MLIRContext *context) {
std::string error_message;
std::unique_ptr<llvm::MemoryBuffer> input =
mlir::openInputFile(model_path, &error_message);
if (!input) {
throw std::runtime_error(error_message);
}
const mlir::FileLineColLoc location =
mlir::FileLineColLoc::get(context, input->getBufferIdentifier(), 0, 0);
auto mlir_module = tflite::FlatBufferToMlir(
absl::string_view(input->getBufferStart(), input->getBufferSize()),
context, location);
if (!mlir_module || mlir::failed(mlir::verify(*mlir_module))) {
throw std::runtime_error(
"Could not convert the TFLite model to its MLIR representation.");
}
return mlir_module;
}
void TOSAChecker::LegalizeTFLToTOSA(mlir::ModuleOp mlir_module) {
mlir::PassManager pm(mlir_module.getContext(),
mlir::OpPassManager::Nesting::Implicit);
mlir::tosa::TOSATFLLegalizationPipelineOptions opts;
mlir::tosa::createTFLtoTOSALegalizationPipeline(pm, opts);
// TODO Don't check for mlir::failed state for now due to some incoherences in
// how the legalization report non-convertible ops (sometimes with a hard
// fail, sometimes without). The legalization should not return a failed
// state if an operator can't be legalized and should leave it in its original
// dialect.
pm.run(mlir_module);
}
std::map<std::string, std::string> TOSAChecker::GetAttributes(
mlir::Operation &op, bool /*elide_large_attrs*/) {
std::map<std::string, std::string> attributes;
for (const mlir::NamedAttribute &attr : op.getAttrs()) {
attributes.emplace(attr.getName().str(),
// TODO Check how to elide large attributes when
// converting them to string, mlir::Attribute::print has
// no mlir::OpPrintingFlags.
GetMLIRRepresentation(attr.getValue()));
}
return attributes;
}
} // namespace tosa_checker
std::ostream &operator<<(std::ostream &os,
const tosa_checker::TOSAChecker::Operator &op) {
os << op.mlir_representation;
return os;
}
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