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torch-mlir/lib/Conversion/TorchToTMTensor/TorchToTMTensor.cpp

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Also available under a BSD-style license. See LICENSE.
//
//===----------------------------------------------------------------------===//
#include "torch-mlir/Conversion/TorchToTMTensor/TorchToTMTensor.h"
#include "../PassDetail.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Dialect/Linalg/IR/Linalg.h"
#include "mlir/IR/MLIRContext.h"
#include "torch-mlir-dialects/Dialect/TMTensor/IR/TMTensorDialect.h"
#include "torch-mlir-dialects/Dialect/TMTensor/IR/TMTensorOps.h"
#include "torch-mlir/Conversion/Utils/Utils.h"
#include "torch-mlir/Dialect/Torch/IR/TorchDialect.h"
#include "torch-mlir/Dialect/Torch/IR/TorchOps.h"
#include "torch-mlir/Dialect/Torch/IR/TorchTypes.h"
#include "torch-mlir/Dialect/Torch/Utils/TorchUpstream.h"
#include "torch-mlir/Dialect/Torch/Utils/Utils.h"
#include "torch-mlir/Dialect/TorchConversion/Transforms/BackendTypeConversion.h"
using namespace mlir;
using namespace mlir::torch;
using namespace mlir::torch::Torch;
using namespace mlir::torch::TorchConversion;
using namespace mlir::torch::TMTensor;
// -----------------------------------------------------------------------------
// Patterns (as this grows, it should be organized into multiple files)
// -----------------------------------------------------------------------------
// This is going to eventually be O(#aten ops), which is in the 100s.
//
// Most of these patterns consist of:
// 1. Checking that the operand/result types and other static properties are
// good-enough to create a valid linalg op (such as operands being of
// ranks/dtypes acceptable to the linalg op).
// 2. Creating dynamic error guards, usually checking a predicate on the
// compatibility of operand shapes.
// 3. Creating init tensors for the computation op. Usually this involves
// reifying IR for a shape transfer function based on the operand shapes.
// 4. Creating a named linalg op to replace the original op.
//
// TODO: Use linalg OpDSL to autogenerate at least 1)/2)/3) such
// that these patterns become mostly mechanical associations of
// "aten.foo -> linalg.foo".
namespace {
// aten::bincount op counts the frequency of each value in a 1-d input tensor of
// non-negative ints.
class ConvertAtenBincountOp : public OpConversionPattern<AtenBincountOp> {
public:
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(AtenBincountOp op, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
if (failed(verifyLinalgCompatibleTypes(op, rewriter)))
return failure();
Location loc = op.getLoc();
MLIRContext *context = op->getContext();
TypeConverter *typeConverter = getTypeConverter();
Value input = adaptor.self();
Value torchTypeInput = op.self();
Value minlength = adaptor.minlength();
Value weights = adaptor.weights();
// TODO: Add a check to verify that the input tensor elements are all
// non-negative.
// Check whether the input is a 1-d tensor of integer type or not.
RankedTensorType inputType = input.getType().cast<RankedTensorType>();
if (inputType.getRank() != 1 ||
!inputType.getElementType().isa<mlir::IntegerType>())
return rewriter.notifyMatchFailure(
op,
"Input tensor has to be a one-dimensional tensor of integer type.");
// Check whether the input tensor element type is i64 or not.
IntegerType inputIntegerType =
inputType.getElementType().cast<IntegerType>();
if (inputIntegerType.getWidth() != 64)
return rewriter.notifyMatchFailure(
op,
"Unimplemented: Integer width not equal to 64 are not supported.");
// TODO: Incorporate the weight argument.
if (!weights.getType().isa<mlir::torch::Torch::NoneType>())
return rewriter.notifyMatchFailure(
op, "Unimplemented, the weights operand is not incorporated.");
// Finding the maximum value in the input tensor.
SmallVector<int64_t> maxTensorSizes;
ValueTensorType maxTensorType = ValueTensorType::get(
context, llvm::makeArrayRef(maxTensorSizes),
torchTypeInput.getType().cast<ValueTensorType>().getDtype());
Value maxTensor =
rewriter.create<AtenMaxOp>(loc, maxTensorType, torchTypeInput);
maxTensor = typeConverter->materializeTargetConversion(
rewriter, loc, typeConverter->convertType(maxTensor.getType()),
maxTensor);
// `maxTensor` is a 0-d tensor, extracting its only element and
// storing it in `maxInput`.
Value maxInput = rewriter.create<tensor::ExtractOp>(loc, maxTensor);
// Creating a tm_tensor.scatter op with the following mapping:
// 1.) `input` tensor maps to the indices in scatter op. `input` is
// expanded from 1-d to 2-d, and its element type is set to i32 as required
// for the scatter op.
// 2.) `updates` is a 1-d dummy tensor with the size equivalent to the
// `input`.
// 3.) `bincount` a 1-d tensor maps to the original in scatter op
// with size equal to the max(max(input) + 1, minlength).
SmallVector<int64_t> expandedInputSizes{inputType.getShape()[0], 1};
ValueTensorType expandInputType = ValueTensorType::get(
context, llvm::makeArrayRef(expandedInputSizes),
torchTypeInput.getType().cast<ValueTensorType>().getDtype());
Value torchCstOne = rewriter.create<Torch::ConstantIntOp>(
loc, rewriter.getI64IntegerAttr(1));
Value expandedInputTensor = rewriter.create<AtenUnsqueezeOp>(
loc, expandInputType, torchTypeInput, torchCstOne);
// Converting the input element type to i32.
Value indices = convertTensorToDtype(
rewriter, loc, expandedInputTensor,
mlir::IntegerType::get(context, 32, mlir::IntegerType::Signed));
indices = typeConverter->materializeTargetConversion(
rewriter, loc, typeConverter->convertType(indices.getType()), indices);
Type resultElemType = typeConverter->convertType(op->getResult(0).getType())
.cast<RankedTensorType>()
.getElementType();
SmallVector<Value, 1> inputSizeDynamic =
getTensorSizesUntilDim(rewriter, loc, input, 0);
Value updatesTensor = rewriter.create<linalg::InitTensorOp>(
loc, getAsOpFoldResult(inputSizeDynamic), resultElemType);
Value constantZero = rewriter.create<arith::ConstantOp>(
loc, rewriter.getZeroAttr(resultElemType));
Value constantOne = rewriter.create<arith::ConstantIntOp>(
loc, 1, resultElemType.getIntOrFloatBitWidth());
// Bincount size = max(max(input) + 1, minlength)
Value maxInputPlusOne =
rewriter.create<arith::AddIOp>(loc, maxInput, constantOne);
Value bincountSize =
rewriter.create<arith::MaxSIOp>(loc, maxInputPlusOne, minlength);
bincountSize = castIntToIndex(rewriter, loc, bincountSize);
Value bincountTensor = createInitTensor(rewriter, loc, {bincountSize},
resultElemType, constantZero);
auto scatterOp = rewriter.create<TMTensor::ScatterOp>(
loc, bincountTensor.getType(), ValueRange{updatesTensor, indices},
ValueRange{bincountTensor},
/*unique_indices=*/false);
Region &scatterOpRegion = scatterOp.region();
auto &scatterOpBlock = scatterOpRegion.emplaceBlock();
scatterOpBlock.addArguments(TypeRange{resultElemType, resultElemType},
{loc, loc});
auto blockArgs = scatterOpBlock.getArguments();
// Creating an add instruction inside the scatter op region to increment the
// frequency counter with one.
OpBuilder regionBuilder(scatterOpRegion);
Value add = regionBuilder.create<arith::AddIOp>(loc,
/*bincount=*/blockArgs[1],
constantOne);
regionBuilder.create<TMTensor::YieldOp>(loc, add);
rewriter.replaceOp(op, scatterOp->getResult(0));
return success();
}
};
} // namespace
namespace {
class ConvertValsemVariantAtenIndexPutImplOp
: public OpConversionPattern<ValsemVariantAtenIndexPutImplOp> {
public:
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(ValsemVariantAtenIndexPutImplOp op, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
if (failed(verifyLinalgCompatibleTypes(op, rewriter)))
return failure();
Location loc = op.getLoc();
MLIRContext *context = op->getContext();
Value input = adaptor.self();
Value values = adaptor.values();
RankedTensorType inputType = input.getType().cast<RankedTensorType>();
RankedTensorType valuesType = values.getType().cast<RankedTensorType>();
Type resultElemType = typeConverter->convertType(op->getResult(0).getType())
.cast<RankedTensorType>()
.getElementType();
// TODO: Add support for the input with rank other than one.
if (inputType.getRank() != 1)
return rewriter.notifyMatchFailure(
op, "unimplemented: input rank other than one is not supported");
// The unsafe should be either `False` or `none`.
if (!op.unsafe().getType().isa<Torch::NoneType>()) {
bool unsafe;
if (!matchPattern(op.unsafe(), m_TorchConstantBool(&unsafe)))
return rewriter.notifyMatchFailure(
op, "unimplemented: unsafe must be a constant");
else if (unsafe)
return rewriter.notifyMatchFailure(
op, "unimplemented: unsafe is expected to be false");
}
// The accumulate should be a torch constant of boolean type.
bool accumulate;
if (!matchPattern(op.accumulate(), m_TorchConstantBool(&accumulate)))
return rewriter.notifyMatchFailure(
op, "Expected accumulate to be constant bool.");
// The element type of the `input` and `values` should be same.
if (inputType.getElementType() != valuesType.getElementType())
return rewriter.notifyMatchFailure(
op, "Input element type should be same as the values element type.");
SmallVector<Value> indicesList;
getListConstructElements(adaptor.indices(), indicesList);
// The size of the list of the index tensors should not be greater than the
// input rank.
if ((int64_t)indicesList.size() > inputType.getRank())
return rewriter.notifyMatchFailure(
op, "Indices list size should not be greater than the input rank.");
// TODO: Add support for cases with indices list size smaller than the input
// rank.
if ((int64_t)indicesList.size() < inputType.getRank())
return rewriter.notifyMatchFailure(
op, "Unimplemented, Indices list size smaller than input rank");
if (indicesList[0].getType().isa<Torch::NoneType>())
return rewriter.notifyMatchFailure(op,
"Indices tensor must not be none.");
// TODO: Add support for the index with rank other than one.
int64_t indexRank = typeConverter->convertType(indicesList[0].getType())
.cast<RankedTensorType>()
.getRank();
if (indexRank != 1)
return rewriter.notifyMatchFailure(
op, "unimplemented: index rank other than one is not supported");
// Creating a tm_tensor.scatter op with the following mapping:
// 1.) Index tensor from the `indicesList` maps to the indices in scatter
// op. Index tensor is expanded from 1-d to 2-d, and its element type is set
// to i32 as required for the scatter op.
// 2.) `values` is mapped to `updates` in scatter op.
// 3.) `input` is mapped to `original` in scatter op.
ValueTensorType indexType =
indicesList[0].getType().cast<ValueTensorType>();
SmallVector<int64_t> expandedIndexSizes{indexType.getSizes()[0], 1};
ValueTensorType expandedIndexType = ValueTensorType::get(
context, llvm::makeArrayRef(expandedIndexSizes), indexType.getDtype());
Value torchCstOne = rewriter.create<Torch::ConstantIntOp>(
loc, rewriter.getI64IntegerAttr(1));
Value expandedIndexTensor = rewriter.create<AtenUnsqueezeOp>(
loc, expandedIndexType, indicesList[0], torchCstOne);
// Converting the index element type to i32.
Value indices = convertTensorToDtype(
rewriter, loc, expandedIndexTensor,
mlir::IntegerType::get(context, 32, mlir::IntegerType::Signed));
indices = typeConverter->materializeTargetConversion(
rewriter, loc, typeConverter->convertType(indices.getType()), indices);
auto scatterOp = rewriter.create<TMTensor::ScatterOp>(
loc, input.getType(), ValueRange{values, indices}, ValueRange{input},
/*unique_indices=*/false);
Region &scatterOpRegion = scatterOp.region();
auto &scatterOpBlock = scatterOpRegion.emplaceBlock();
scatterOpBlock.addArguments(TypeRange{resultElemType, resultElemType},
{loc, loc});
auto blockArgs = scatterOpBlock.getArguments();
OpBuilder regionBuilder(scatterOpRegion);
Value update = blockArgs[0];
Value original = blockArgs[1];
Value yieldValue = update;
// Create an add instruction inside the scatter op region to increment the
// `original` value with the value from `updates` if the accumulate flag is
// true.
if (accumulate) {
if (inputType.getElementType().isa<mlir::IntegerType>())
yieldValue = regionBuilder.create<arith::AddIOp>(loc, original, update);
else if (inputType.getElementType().isa<mlir::FloatType>())
yieldValue = regionBuilder.create<arith::AddFOp>(loc, original, update);
}
regionBuilder.create<TMTensor::YieldOp>(loc, yieldValue);
rewriter.replaceOp(op, scatterOp->getResult(0));
return success();
}
};
} // namespace
// -----------------------------------------------------------------------------
// The pass
// -----------------------------------------------------------------------------
namespace {
class ConvertTorchToTMTensor
: public ConvertTorchToTMTensorBase<ConvertTorchToTMTensor> {
public:
void getDependentDialects(DialectRegistry &registry) const override {
registry.insert<linalg::LinalgDialect>();
registry.insert<func::FuncDialect>();
registry.insert<tensor::TensorDialect>();
registry.insert<arith::ArithmeticDialect>();
registry.insert<TMTensorDialect>();
TorchConversion::getBackendTypeConversionDependentDialects(registry);
}
void runOnOperation() override {
MLIRContext *context = &getContext();
ConversionTarget target(*context);
target.addLegalDialect<linalg::LinalgDialect, func::FuncDialect,
tensor::TensorDialect, arith::ArithmeticDialect,
Torch::TorchDialect, TMTensorDialect>();
TypeConverter typeConverter;
typeConverter.addConversion([](Type type) { return type; });
TorchConversion::setupBackendTypeConversion(target, typeConverter);
RewritePatternSet patterns(context);
target.addIllegalOp<AtenBincountOp>();
patterns.add<ConvertAtenBincountOp>(typeConverter, context);
target.addIllegalOp<ValsemVariantAtenIndexPutImplOp>();
patterns.add<ConvertValsemVariantAtenIndexPutImplOp>(typeConverter,
context);
if (failed(applyPartialConversion(getOperation(), target,
std::move(patterns))))
return signalPassFailure();
}
};
} // namespace
std::unique_ptr<OperationPass<FuncOp>>
mlir::torch::createConvertTorchToTMTensorPass() {
return std::make_unique<ConvertTorchToTMTensor>();
}
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