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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. | ||
| */ | ||
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| /*! | ||
| * \file strided_slice.h | ||
| * \brief Utility functions for strided_slice op | ||
| */ | ||
| #ifndef TVM_TOPI_DETAIL_STRIDED_SLICE_H_ | ||
| #define TVM_TOPI_DETAIL_STRIDED_SLICE_H_ | ||
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| #include <tvm/tir/expr.h> | ||
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| #include <limits> | ||
| #include <vector> | ||
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| #include "constant_utils.h" | ||
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| namespace tvm { | ||
| namespace topi { | ||
| namespace detail { | ||
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| using namespace tvm::te; | ||
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| inline int64_t CanonicalizeIndex(int64_t index, int64_t extent, int64_t stride) { | ||
| int64_t begin_range = stride < 0 ? -1 : 0; | ||
| int64_t end_range = stride < 0 ? extent - 1 : extent; | ||
| if (index < 0) { | ||
| index += extent; | ||
| } | ||
| return std::min(std::max(index, begin_range), end_range); | ||
| } | ||
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| inline std::tuple<std::vector<int64_t>, std::vector<int64_t>, std::vector<int64_t>> ConvertToVec( | ||
| const Array<Integer>& begin, const Array<Integer>& end, const Array<Integer>& strides, | ||
| std::string slice_mode) { | ||
| std::vector<int64_t> stride_vec(strides.size(), 1); | ||
| if (slice_mode == "end") { | ||
| for (size_t i = 0; i < strides.size(); ++i) { | ||
| ICHECK(strides[i].defined()); | ||
| stride_vec[i] = GetConstInt(strides[i]); | ||
| } | ||
| } | ||
| const int64_t max_range = std::numeric_limits<int64_t>::max(); | ||
| std::vector<int64_t> begin_vec; | ||
| for (size_t i = 0; i < begin.size(); ++i) { | ||
| if (!begin[i].defined()) { | ||
| // value=None | ||
| begin_vec.push_back(stride_vec[i] > 0 ? 0 : max_range); | ||
| } else { | ||
| begin_vec.push_back(GetConstInt(begin[i])); | ||
| } | ||
| } | ||
| std::vector<int64_t> end_vec; | ||
| for (size_t i = 0; i < end.size(); ++i) { | ||
| // allow end to be None | ||
| if (!end[i].defined()) { | ||
| end_vec.push_back(stride_vec[i] < 0 ? 0 : max_range); | ||
| } else if (slice_mode == "size") { | ||
| int64_t end_val = GetConstInt(end[i]); | ||
| if (end_val < 0) { | ||
| end_vec.push_back(stride_vec[i] < 0 ? 0 : max_range); | ||
| } else { | ||
| end_vec.push_back(begin_vec[i] + end_val); | ||
| } | ||
| } else { | ||
| end_vec.push_back(GetConstInt(end[i])); | ||
| } | ||
| } | ||
| return std::make_tuple(begin_vec, end_vec, stride_vec); | ||
| } | ||
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| inline Array<PrimExpr> StridedSliceCanonicalizeBegin(const Array<PrimExpr>& ishape, | ||
| const std::vector<int64_t>& begin, | ||
| const std::vector<int64_t>& strides, | ||
| const Array<Integer>& axes, DataType dtype, | ||
| std::string slice_mode = "end") { | ||
| Array<PrimExpr> begin_expr; | ||
| for (size_t i = 0; i < axes.size(); ++i) { | ||
| if (ishape[axes[i]]->IsInstance<tvm::IntImmNode>()) { | ||
| int64_t dim_i = GetConstInt(ishape[axes[i]]); | ||
| int64_t begin_i = CanonicalizeIndex(begin[i], dim_i, strides[i]); | ||
| begin_expr.push_back(make_const(dtype, begin_i)); | ||
| } else { | ||
| auto idim = ishape[axes[i]]; | ||
| auto b_expr = make_const(dtype, begin[i]); | ||
| PrimExpr b = begin[i] < 0 ? b_expr + idim : b_expr; | ||
| auto s = strides[i]; | ||
| if (s < 0) { | ||
| b = tvm::min(b, idim - 1); | ||
| } else { | ||
| b = tvm::if_then_else(b < 0, 0, b); | ||
| } | ||
| begin_expr.push_back(b); | ||
| } | ||
| } | ||
| return begin_expr; | ||
| } | ||
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| inline Array<PrimExpr> StridedSliceOutputShape(const Array<PrimExpr>& ishape, | ||
| const std::vector<int64_t>& begin, | ||
| const std::vector<int64_t>& end, | ||
| const std::vector<int64_t>& strides, | ||
| const Array<Integer>& axes, std::string slice_mode, | ||
| const Array<PrimExpr>& begin_canonicalized, | ||
| bool use_any = false) { | ||
| const size_t src_tensor_dim = ishape.size(); | ||
| Array<PrimExpr> out_shape; | ||
| for (size_t i = 0; i < src_tensor_dim; ++i) { | ||
| out_shape.push_back(ishape[i]); | ||
| } | ||
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| for (size_t i = 0; i < axes.size(); ++i) { | ||
| if (ishape[axes[i]]->IsInstance<tvm::IntImmNode>()) { | ||
| const int64_t dim_i = GetConstInt(ishape[axes[i]]); | ||
| ICHECK(begin_canonicalized[i]->IsInstance<tvm::IntImmNode>()); | ||
| int64_t begin_i = GetConstInt(begin_canonicalized[i]); | ||
| int64_t end_i = CanonicalizeIndex(end[i], dim_i, strides[i]); | ||
| int interval = std::abs(end_i - begin_i); | ||
| int slice_size = | ||
| static_cast<int>((interval + std::abs(strides[i]) - 1) / std::abs(strides[i])); | ||
| ICHECK(strides[i] < 0 ? (end_i <= begin_i) : (begin_i <= end_i)) | ||
| << ": Input [Begin=" << begin[i] << ", End=" << end[i] << "] is invalid for axis=" << i; | ||
| out_shape.Set(axes[i], cast(out_shape[i].dtype(), PrimExpr(slice_size))); | ||
| } else if (use_any) { | ||
| out_shape.Set(axes[i], tvm::tir::Any()); | ||
| } else { | ||
| out_shape.Set(axes[i], tvm::tir::Var("dim", out_shape[i]->dtype)); | ||
| } | ||
| } | ||
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| return out_shape; | ||
| } | ||
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| } // namespace detail | ||
| } // namespace topi | ||
| } // namespace tvm | ||
| #endif // TVM_TOPI_DETAIL_STRIDED_SLICE_H_ |
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