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5f923cd | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | // Copyright 2025 The ODML Authors.
//
// Licensed 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.
#include "runtime/util/lora_util.h"
#include <cstddef>
#include <cstdint>
#include <memory>
#include <utility>
#include "absl/memory/memory.h" // from @com_google_absl
#include "absl/status/statusor.h" // from @com_google_absl
#include "absl/strings/string_view.h" // from @com_google_absl
#include "runtime/util/memory_mapped_file.h"
#include "runtime/util/scoped_file.h"
#include "runtime/util/status_macros.h"
#include "re2/re2.h" // from @com_googlesource_code_re2
namespace litert::lm {
namespace {
constexpr LazyRE2 kLoRAInputNamePattern = {
"^(?:(?:query|key|value|post)_w_prime_(?:left|right)|"
"lora_atten_(?:q|k|v|o)_(?:a|b)_prime_weight)_\\d+$"};
uint64_t AlignByN(uint64_t number, uint64_t n) {
const uint64_t q = number / n;
return (number % n == 0 ? q : q + 1) * n;
}
} // namespace
// Gets an offset and size which will be valid to pass to
// MemoryMappedFile.
absl::StatusOr<std::unique_ptr<MemoryMappedFileWithAutoAlignment>>
MemoryMappedFileWithAutoAlignment::Create(ScopedFile::PlatformFile file,
uint64_t offset, uint64_t size,
absl::string_view key) {
const size_t kAlignment = MemoryMappedFile::GetOffsetAlignment();
uint64_t aligned_offset = (offset / kAlignment) * kAlignment;
uint64_t map_size;
if (size == 0) {
map_size = 0; // Map to the end of the file.
} else {
map_size = AlignByN(offset - aligned_offset + size, kAlignment);
}
ASSIGN_OR_RETURN(auto region, MemoryMappedFile::Create(file, aligned_offset,
map_size, key));
uint64_t internal_offset = offset - aligned_offset;
uint64_t final_size;
if (size == 0) {
final_size = region->length() - internal_offset;
} else {
final_size = size;
}
return absl::WrapUnique(new MemoryMappedFileWithAutoAlignment(
std::move(region), internal_offset, final_size));
}
// Returns true if the given name is a LoRA input name for the model.
// The LoRA name is in the format of
// "(query|key|value|post)_w_prime_(left|right)_[0-num_layers)" or
// "lora_atten_(q|k|v|o)_(a|b)_prime_weight_[0-num_layers)".
bool IsLoRAInputName(absl::string_view name) {
return RE2::FullMatch(name, *kLoRAInputNamePattern);
}
} // namespace litert::lm
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