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Some more XLATensor cleanup. #1110

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Oct 23, 2020
Merged

Some more XLATensor cleanup. #1110

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33 changes: 30 additions & 3 deletions Sources/CX10/xla_tensor_ops_wrapper.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,11 @@ xla::XlaOp LowerBinaryValueOp(xla::XlaOp lhs, xla::XlaOp rhs) {
return T(lhs, rhs);
}

std::vector<xla::XlaOp> LowerBroadcastTensors(xla::XlaOp lhs, xla::XlaOp rhs) {
std::tie(lhs, rhs) = XlaHelpers::PromoteValues(lhs, rhs);
return {lhs, rhs};
}

xla::XlaOp LowerSqueeze(xla::XlaOp input, int dim) {
if (dim == -1) return SqueezeAllTrivialDimensions(input);
XLA_CHECK_GE(dim, 0);
Expand Down Expand Up @@ -324,9 +329,7 @@ xla::XlaOp LowerTfUnsortedSegmentSum(xla::XlaOp data, xla::XlaOp indices,
combine);
}

xla::XlaOp LowerTfStatelessRandomUniform(xla::Shape shape, xla::XlaOp seeds,
xla::XlaOp minval, xla::XlaOp maxval,
LoweringContext* loctx = nullptr) {
xla::BitGeneratorTy GetBestGenerator(LoweringContext* loctx = nullptr) {
xla::BitGeneratorTy generator;
if (!loctx || loctx->device().hw_type == swift_xla::DeviceType::TPU) {
generator = xla::ThreeFryBitGenerator;
Expand All @@ -336,6 +339,30 @@ xla::XlaOp LowerTfStatelessRandomUniform(xla::Shape shape, xla::XlaOp seeds,
return xla::PhiloxBitGenerator(key, state, shape);
};
}
return generator;
}

xla::XlaOp LowerTfStatelessRandomNormal(xla::Shape shape, xla::XlaOp seeds,
at::ScalarType dtype,
LoweringContext* loctx = nullptr) {
auto generator = GetBestGenerator(loctx);
xla::XlaOp seed0 = xla::Reshape(xla::Slice(seeds, {0}, {1}, {1}), {});
xla::XlaOp seed1 = xla::Reshape(xla::Slice(seeds, {1}, {2}, {1}), {});
xla::XlaOp initial_state =
xla::ConstantR0WithType(seeds.builder(), xla::U64, 0);
xla::XlaOp key = ConvertElementType(seed0, xla::U64) |
ShiftLeft(ConvertElementType(seed1, xla::U64),
ConstantR0WithType(seeds.builder(), xla::U64, 32));
xla::XlaOp normal =
xla::NormalFloatingPointDistribution(key, initial_state, generator, shape)
.value;
return normal;
}

xla::XlaOp LowerTfStatelessRandomUniform(xla::Shape shape, xla::XlaOp seeds,
xla::XlaOp minval, xla::XlaOp maxval,
LoweringContext* loctx = nullptr) {
auto generator = GetBestGenerator(loctx);
xla::XlaOp seed0 = xla::Reshape(xla::Slice(seeds, {0}, {1}, {1}), {});
xla::XlaOp seed1 = xla::Reshape(xla::Slice(seeds, {1}, {2}, {1}), {});
xla::XlaOp key = ConvertElementType(seed0, xla::U64) |
Expand Down
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