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torch-mlir/lib/Conversion/TorchToLinalg/TensorConstructors.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/TorchToLinalg/TorchToLinalg.h"
#include "../PassDetail.h"
#include "PopulatePatterns.h"
#include "Utils.h"
#include "mlir/Dialect/Arith/IR/Arith.h"
#include "mlir/Dialect/ControlFlow/IR/ControlFlowOps.h"
#include "mlir/Dialect/Linalg/IR/Linalg.h"
#include "mlir/Dialect/Math/IR/Math.h"
#include "mlir/Dialect/Tensor/IR/Tensor.h"
#include "mlir/IR/Matchers.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/Utils/TorchUpstream.h"
#include "torch-mlir/Dialect/Torch/Utils/Utils.h"
using namespace mlir;
using namespace mlir::torch;
using namespace mlir::torch::Torch;
namespace {
class ConvertAtenConstantPadNdOp
: public OpConversionPattern<AtenConstantPadNdOp> {
public:
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(AtenConstantPadNdOp op, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
if (failed(verifyLinalgCompatibleTypes(op, rewriter)))
return failure();
Location loc = op->getLoc();
Value self = adaptor.getSelf();
auto type = self.getType().cast<RankedTensorType>();
int64_t rank = type.getRank();
// Pattern match against the op's original operands, because otherwise we
// will get the lowered version of the operands which is harder to pattern
// match.
SmallVector<int64_t> padInts;
if (!matchPattern(op.getPad(), m_TorchListOfConstantInts(padInts)))
return rewriter.notifyMatchFailure(
op, "only support constant int pad ranges");
uint64_t padRank = padInts.size() / 2;
if (padRank * 2 != padInts.size())
return rewriter.notifyMatchFailure(op, "pad range size is not even");
if (rank < 0 || padRank > (uint64_t)rank)
return rewriter.notifyMatchFailure(op, "padding exceeds tensor rank");
// Initialize low/high paddings with the dims that should not be padded.
SmallVector<int64_t, 4> lowPadding(/*Size=*/rank - padRank, /*Value=*/0);
SmallVector<int64_t, 4> highPadding(/*Size=*/rank - padRank, /*Value=*/0);
// Add the requested padding - note op.pad() is highest dim first ordered
// pairs of low,high.
for (uint64_t i = padRank; i > 0; --i) {
lowPadding.push_back(padInts[i * 2 - 2]);
highPadding.push_back(padInts[i * 2 - 1]);
}
Type newResultType = getTypeConverter()->convertType(op.getType());
Type elementType = newResultType.cast<RankedTensorType>().getElementType();
Value castedValue =
convertScalarToDtype(rewriter, loc, adaptor.getValue(), elementType);
Value paddedInput = torch_to_linalg::getPaddedTensor(
op, rewriter, self, lowPadding, highPadding, castedValue);
rewriter.replaceOpWithNewOp<tensor::CastOp>(op, newResultType, paddedInput);
return success();
}
};
} // namespace
namespace {
// Converts constant tensor allocation like ops.
template <typename OpTy, int fillVal>
class ConvertConstantTensorAllocOp : public OpConversionPattern<OpTy> {
public:
using OpConversionPattern<OpTy>::OpConversionPattern;
LogicalResult
matchAndRewrite(OpTy op, typename OpTy::Adaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
if (failed(verifyLinalgCompatibleTypes(op, rewriter)))
return failure();
// TODO: Add support for layout, pin_memory features.
// Only `none` layout is supported.
// At this point all tensors should have value semantics, and hence the
// `layout` check can be ignored.
// The pin_memory should be either `False` or `none`.
bool pinMemory;
if (!op.getPinMemory().getType().template isa<Torch::NoneType>() &&
(!matchPattern(op.getPinMemory(), m_TorchConstantBool(&pinMemory)) ||
pinMemory)) {
return rewriter.notifyMatchFailure(
op, "unimplemented: pin_memory must be either None or false");
}
Location loc = op.getLoc();
TypeConverter *typeConverter = this->getTypeConverter();
SmallVector<Value> resultSizeTorchInt, resultSize, resultSizeIndex;
if (!getListConstructElements(op.getSize(), resultSizeTorchInt)) {
return rewriter.notifyMatchFailure(
op, "unimplemented: size must be constructed using ListConstruct");
}
resultSize = getTypeConvertedValues(rewriter, loc, typeConverter,
resultSizeTorchInt);
for (auto size : resultSize)
resultSizeIndex.push_back(castIntToIndex(rewriter, loc, size));
auto resultType = typeConverter->convertType(op.getType())
.template cast<RankedTensorType>();
Type resultElementType;
if (op.getDtype().getType().template isa<Torch::NoneType>()) {
resultElementType = resultType.getElementType();
} else {
int64_t dtypeInt;
if (!matchPattern(op.getDtype(), m_TorchConstantInt(&dtypeInt)))
return rewriter.notifyMatchFailure(
op, "unimplemented: dtype must be a constant integer or none");
resultElementType = getTypeForScalarType(
op->getContext(), (torch_upstream::ScalarType)dtypeInt,
IntegerType::Signless);
}
// Create an uninitialized tensor of `resultSize` shape and fill it with
// value `fillVal`.
Value constVal = getConstant(rewriter, loc, fillVal, resultElementType);
Value outputTensor =
createInitTensor(rewriter, loc, resultSizeIndex, resultElementType, constVal);
rewriter.replaceOpWithNewOp<tensor::CastOp>(op, resultType, outputTensor);
return success();
}
};
} // namespace
namespace {
// Converts `aten.empty` to `linalg.init_tensor` op.
class ConvertAtenEmptyMemoryFormatOp
: public OpConversionPattern<AtenEmptyMemoryFormatOp> {
public:
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(AtenEmptyMemoryFormatOp op, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
if (failed(verifyLinalgCompatibleTypes(op, rewriter)))
return failure();
// TODO: Add support pin_memory and memory_format features.
// At this point all tensors should have value semantics, and hence the
// `layout` check can be ignored.
// The pin_memory should be either `False` or `none`.
bool pinMemory;
if (!op.getPinMemory().getType().template isa<Torch::NoneType>() &&
(!matchPattern(op.getPinMemory(), m_TorchConstantBool(&pinMemory)) ||
pinMemory))
return rewriter.notifyMatchFailure(
op, "unimplemented: pin_memory must be either None or false");
// Only `none`, `contiguous` and `preserve` memory_format is supported.
if (!op.getMemoryFormat().getType().isa<Torch::NoneType>()) {
int64_t memoryFormat;
if (!matchPattern(op.getMemoryFormat(), m_TorchConstantInt(&memoryFormat)))
return rewriter.notifyMatchFailure(
op, "unimplemented: the memory format should be specified in "
"an integer constant");
if (memoryFormat != torch_upstream::MemoryFormat::Contiguous &&
memoryFormat != torch_upstream::MemoryFormat::Preserve)
return rewriter.notifyMatchFailure(
op, "unimplemented: only none, contiguous and preserve "
"memory_format is supported");
}
// TODO: Add support for device arg other than cpu.
if (!op.getDevice().getType().isa<Torch::NoneType>()) {
std::string device;
if (!matchPattern(op.getDevice(), m_TorchConstantDevice(device)))
return rewriter.notifyMatchFailure(
op, "unimplemented: device must be a constant str");
else if (device != "cpu")
return rewriter.notifyMatchFailure(
op, "unimplemented: device is expected to be cpu");
}
// TODO: Add support for non-strided layout.
// torch.layout is by default strided i.e. 0.
if (!op.getLayout().getType().isa<Torch::NoneType>()) {
int64_t tensorLayout;
if (!matchPattern(op.getLayout(), m_TorchConstantInt(&tensorLayout)))
return rewriter.notifyMatchFailure(
op, "unimplemented: layout must be a constant");
else if (tensorLayout != torch_upstream::Layout::Strided)
return rewriter.notifyMatchFailure(
op, "unimplemented: layout is expected to be strided");
}
Location loc = op.getLoc();
TypeConverter *typeConverter = this->getTypeConverter();
SmallVector<Value> resultSizeTorchInt, resultSize, resultSizeIndex;
if (!getListConstructElements(op.getSize(), resultSizeTorchInt)) {
return rewriter.notifyMatchFailure(
op, "unimplemented: size must be constructed using ListConstruct");
}
resultSize = getTypeConvertedValues(rewriter, loc, typeConverter,
resultSizeTorchInt);
for (auto size : resultSize)
resultSizeIndex.push_back(castIntToIndex(rewriter, loc, size));
auto resultType =
typeConverter->convertType(op.getType()).cast<RankedTensorType>();
Type resultElementType;
if (op.getDtype().getType().isa<Torch::NoneType>()) {
resultElementType = resultType.getElementType();
} else {
int64_t dtypeInt;
if (!matchPattern(op.getDtype(), m_TorchConstantInt(&dtypeInt)))
return rewriter.notifyMatchFailure(
op, "unimplemented: dtype must be a constant integer or none");
resultElementType = getTypeForScalarType(
op->getContext(), (torch_upstream::ScalarType)dtypeInt,
IntegerType::Signless);
}
// Create an uninitialized tensor of `resultSize` shape.
Value initTensor = rewriter.create<tensor::EmptyOp>(
loc, getAsOpFoldResult(resultSizeIndex), resultElementType);
rewriter.replaceOpWithNewOp<tensor::CastOp>(op, resultType, initTensor);
return success();
}
};
} // namespace
namespace {
// Let's say the result of the `aten.arange.start_step` is `output` which is a
// 1-d output tensor. The approach used for generating the output tensor is as
// follows:
// for i in range(ceil((end-start)/step))
// output[i] = start + (i * step)
class ConvertAtenArangeStartStepOp
: public OpConversionPattern<AtenArangeStartStepOp> {
public:
using OpConversionPattern::OpConversionPattern;
LogicalResult
matchAndRewrite(AtenArangeStartStepOp op, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
if (failed(verifyLinalgCompatibleTypes(op, rewriter)))
return failure();
// TODO: Add support for pin_memory features.
// At this point all tensors should have value semantics, and hence the
// `layout` check can be ignored.
// The pin_memory should be either `False` or `none`.
bool pinMemory;
if (!op.getPinMemory().getType().isa<Torch::NoneType>() &&
(!matchPattern(op.getPinMemory(), m_TorchConstantBool(&pinMemory)) ||
pinMemory)) {
return rewriter.notifyMatchFailure(
op, "unimplemented: pin_memory must be either None or false");
}
Location loc = op.getLoc();
TypeConverter *typeConverter = this->getTypeConverter();
RankedTensorType resultType =
typeConverter->convertType(op->getResult(0).getType())
.cast<RankedTensorType>();
Type dtype = resultType.getElementType();
Value start = convertScalarToDtype(rewriter, loc, adaptor.getStart(), dtype);
Value end = convertScalarToDtype(rewriter, loc, adaptor.getEnd(), dtype);
Value step = convertScalarToDtype(rewriter, loc, adaptor.getStep(), dtype);
// The result will always be a 1-d tensor.
// The size of the result is calculated as follows:
// ceil((end - start)/step)
Value resultShape;
if (dtype.isa<mlir::IntegerType>()) {
Value subOut = rewriter.create<arith::SubIOp>(loc, end, start);
resultShape = rewriter.create<arith::CeilDivSIOp>(loc, subOut, step);
} else {
Value subOut = rewriter.create<arith::SubFOp>(loc, end, start);
Value divOut = rewriter.create<arith::DivFOp>(loc, subOut, step);
Value ceilOut = rewriter.create<math::CeilOp>(loc, divOut);
resultShape =
rewriter.create<arith::FPToUIOp>(loc, rewriter.getI64Type(), ceilOut);
}
resultShape = castIntToIndex(rewriter, loc, resultShape);
Value resultTensor = rewriter.create<tensor::EmptyOp>(
loc, getAsOpFoldResult(resultShape), dtype);
auto iteratorType = utils::IteratorType::parallel;
AffineMap indexingMap =
AffineMap::getMultiDimIdentityMap(1, op->getContext());
Value finalRes =
rewriter
.create<linalg::GenericOp>(
loc, /*resultTensorTypes=*/resultTensor.getType(),
/*inputs=*/ValueRange({}),
/*outputs=*/resultTensor,
/*indexingMaps=*/indexingMap,
/*iteratorTypes=*/iteratorType,
[&](OpBuilder &b, Location loc, ValueRange payloadArgs) {
Value index = b.create<linalg::IndexOp>(loc, 0);
index = castIndexToInt64(b, loc, index);
index = convertScalarToDtype(b, loc, index, dtype);
Value mulOut, result;
if (dtype.isa<mlir::FloatType>()) {
mulOut = b.create<arith::MulFOp>(loc, step, index);
result = b.create<arith::AddFOp>(loc, start, mulOut);
} else {
mulOut = b.create<arith::MulIOp>(loc, step, index);
result = b.create<arith::AddIOp>(loc, start, mulOut);
}
b.create<linalg::YieldOp>(loc, result);
})
.getResult(0);
rewriter.replaceOpWithNewOp<tensor::CastOp>(op, resultType, finalRes);
return success();
}
};
} // namespace
void mlir::torch::torch_to_linalg::
populateTensorConstructorsPatternsAndLegality(TypeConverter &typeConverter,
RewritePatternSet &patterns,
ConversionTarget &target) {
MLIRContext *context = patterns.getContext();
target.addIllegalOp<AtenConstantPadNdOp>();
patterns.add<ConvertAtenConstantPadNdOp>(typeConverter, context);
target.addIllegalOp<AtenZerosOp, AtenOnesOp>();
patterns.add<ConvertConstantTensorAllocOp<AtenZerosOp, 0>>(typeConverter,
context);
patterns.add<ConvertConstantTensorAllocOp<AtenOnesOp, 1>>(typeConverter,
context);
target.addIllegalOp<AtenEmptyMemoryFormatOp>();
patterns.add<ConvertAtenEmptyMemoryFormatOp>(typeConverter, context);
patterns.add<ConvertAtenArangeStartStepOp>(typeConverter, context);
target.addIllegalOp<AtenArangeStartStepOp>();
}
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