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| 1 | +/* |
| 2 | + * SPDX-FileCopyrightText: 2024 Binsparse Developers |
| 3 | + * |
| 4 | + * SPDX-License-Identifier: BSD-3-Clause |
| 5 | + */ |
| 6 | + |
| 7 | +#pragma once |
| 8 | + |
| 9 | +#include <binsparse/array.h> |
| 10 | +#include <binsparse/structure.h> |
| 11 | + |
| 12 | +typedef enum { |
| 13 | + BSP_TENSOR_SPARSE = 0, |
| 14 | + BSP_TENSOR_DENSE = 1, |
| 15 | + BSP_TENSOR_ELEMENT = 2, |
| 16 | +} bsp_level_kind_t; |
| 17 | + |
| 18 | +typedef struct { |
| 19 | + bsp_level_kind_t kind; |
| 20 | + // data here should be bsp_element_t*, bsp_sparse_t*, or bsp_dense_t* |
| 21 | + void* data; |
| 22 | +} bsp_level_t; |
| 23 | + |
| 24 | +// corresponds to BSP_TENSOR_ELEMENT |
| 25 | +typedef struct { |
| 26 | + bsp_array_t values; |
| 27 | +} bsp_element_t; |
| 28 | + |
| 29 | +// corresponds to BSP_TENSOR_SPARSE |
| 30 | +typedef struct { |
| 31 | + int rank; |
| 32 | + // pointers_to, while it will only ever point to one bsp_array_t, must be kept |
| 33 | + // as a pointer (rather than a struct) because there are cases where it MUST |
| 34 | + // be null. |
| 35 | + bsp_array_t* pointers_to; |
| 36 | + // indices is supposed to be an array of bsp_array_t's. |
| 37 | + bsp_array_t* indices; |
| 38 | + bsp_level_t* child; |
| 39 | +} bsp_sparse_t; |
| 40 | + |
| 41 | +// corresponds to BSP_TENSOR_DENSE |
| 42 | +typedef struct { |
| 43 | + int rank; |
| 44 | + bsp_level_t* child; |
| 45 | +} bsp_dense_t; |
| 46 | + |
| 47 | +typedef struct { |
| 48 | + int rank; |
| 49 | + size_t* dims; |
| 50 | + size_t* transpose; |
| 51 | + size_t nnz; |
| 52 | + bool is_iso; |
| 53 | + |
| 54 | + bsp_level_t* level; |
| 55 | + // don't think too much about this at the moment. |
| 56 | + bsp_structure_t structure; |
| 57 | +} bsp_tensor_t; |
| 58 | + |
| 59 | +static inline bsp_tensor_t bsp_construct_default_tensor_t() { |
| 60 | + bsp_tensor_t tensor; |
| 61 | + tensor.structure = BSP_GENERAL; |
| 62 | + tensor.is_iso = false; |
| 63 | + tensor.nnz = tensor.rank = 0; |
| 64 | + tensor.dims = NULL; |
| 65 | + tensor.transpose = NULL; |
| 66 | + |
| 67 | + tensor.level = NULL; |
| 68 | + return tensor; |
| 69 | +} |
| 70 | + |
| 71 | +static void bsp_destroy_level_t(bsp_level_t* level) { |
| 72 | + if (level == NULL) |
| 73 | + return; |
| 74 | + switch (level->kind) { |
| 75 | + case BSP_TENSOR_ELEMENT: { |
| 76 | + bsp_element_t* element = (bsp_element_t*) level->data; |
| 77 | + bsp_destroy_array_t(element->values); |
| 78 | + free(element); |
| 79 | + break; |
| 80 | + } |
| 81 | + case BSP_TENSOR_DENSE: { |
| 82 | + bsp_dense_t* dense = (bsp_dense_t*) level->data; |
| 83 | + bsp_destroy_level_t(dense->child); |
| 84 | + free(dense); |
| 85 | + break; |
| 86 | + } |
| 87 | + case BSP_TENSOR_SPARSE: { |
| 88 | + bsp_sparse_t* sparse = (bsp_sparse_t*) level->data; |
| 89 | + |
| 90 | + if (sparse->pointers_to != NULL) |
| 91 | + bsp_destroy_array_t(*sparse->pointers_to); |
| 92 | + if (sparse->indices != NULL) { |
| 93 | + for (int i = 0; i < sparse->rank; i++) { |
| 94 | + bsp_destroy_array_t(sparse->indices[i]); |
| 95 | + } |
| 96 | + } |
| 97 | + bsp_destroy_level_t(sparse->child); |
| 98 | + free(sparse); |
| 99 | + break; |
| 100 | + } |
| 101 | + default:; |
| 102 | + } |
| 103 | +} |
| 104 | + |
| 105 | +static bsp_array_t bsp_get_tensor_values(bsp_tensor_t tensor) { |
| 106 | + bsp_level_t* level = tensor.level; |
| 107 | + while (level != NULL) { |
| 108 | + switch (level->kind) { |
| 109 | + case BSP_TENSOR_ELEMENT: { |
| 110 | + bsp_element_t* element = (bsp_element_t*) level->data; |
| 111 | + return element->values; |
| 112 | + break; |
| 113 | + } |
| 114 | + case BSP_TENSOR_SPARSE: { |
| 115 | + bsp_sparse_t* sparse = (bsp_sparse_t*) level->data; |
| 116 | + level = sparse->child; |
| 117 | + break; |
| 118 | + } |
| 119 | + case BSP_TENSOR_DENSE: { |
| 120 | + bsp_dense_t* dense = (bsp_dense_t*) level->data; |
| 121 | + level = dense->child; |
| 122 | + break; |
| 123 | + } |
| 124 | + default:; |
| 125 | + } |
| 126 | + } |
| 127 | + // this should never happen! |
| 128 | + assert(false); |
| 129 | +} |
| 130 | + |
| 131 | +static inline void bsp_destroy_tensor_t(bsp_tensor_t tensor) { |
| 132 | + bsp_destroy_level_t(tensor.level); |
| 133 | + if (tensor.dims != NULL) |
| 134 | + free(tensor.dims); |
| 135 | + if (tensor.transpose != NULL) |
| 136 | + free(tensor.transpose); |
| 137 | +} |
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