mirror of
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485 lines
24 KiB
Markdown
485 lines
24 KiB
Markdown
# Changelog
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All notable changes to this project will be documented in this file.
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The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
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and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
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## [Unreleased]
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### Added
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- Fused inplace-dropout in FFN layer in Transformer
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- `--force-decode` option for marian-decoder
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- `--output-sampling` now works with ensembles (requires proper normalization via e.g `--weights 0.5 0.5`)
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### Fixed
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- Make concat factors not break old vector implementation
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- Use allocator in hashing
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- Read/restore checkpoints from main process only when training with MPI
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- Multi-loss casts type to first loss-type before accumulation (aborted before due to missing cast)
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- Throw `ShapeSizeException` if total expanded shape size exceeds numeric capacity of the maximum int value (2^31-1)
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- During mini-batch-fitting, catch `ShapeSizeException` and use another sizing hint. Aborts outside mini-batch-fitting.
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- Fix incorrect/missing gradient accumulation with delay > 1 or large effective batch size of biases of affine operations.
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- Fixed case augmentation with multi-threaded reading.
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- Scripts using PyYAML now use `safe_load`; see https://msg.pyyaml.org/load
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- Fixed check for `fortran_ordering` in cnpy
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- Fixed fp16 training/inference with factors-combine concat method
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- Fixed clang 13.0.1 compatibility
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- Fixed potential vulnerabilities from lxml<4.9.1 or mistune<2.0.31
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### Changed
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- Parameter synchronization in local sharding model now executes hash checksum before syncing
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- Make guided-alignment faster via sparse memory layout, add alignment points for EOS, remove losses other than ce
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- Negative `--workspace -N` value allocates workspace as total available GPU memory minus N megabytes.
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- Set default parameters for cost-scaling to 8.f 10000 1.f 8.f, i.e. when scaling scale by 8 and do not try to automatically scale up or down. This seems most stable.
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- Make guided-alignment faster via sparse memory layout, add alignment points for EOS, remove losses other than ce.
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- Changed minimal C++ standard to C++-17
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- Faster LSH top-k search on CPU
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- Updated intgemm to the latest upstream version
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- Parameters in npz files are no longer implicitly assumed to be row-ordered. Non row-ordered parameters will result in an abort
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- Updated Catch2 header from 2.10.1 to 2.13.9
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## [1.11.0] - 2022-02-08
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### Added
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- Parallelized data reading with e.g. `--data-threads 8`
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- Top-k sampling during decoding with e.g. `--output-sampling topk 10`
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- Improved mixed precision training with `--fp16`
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- Set FFN width in decoder independently from encoder with e.g. `--transformer-dim-ffn 4096 --transformer-decoder-dim-ffn 2048`
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- Adds option `--add-lsh` to marian-conv which allows the LSH to be memory-mapped.
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- Early stopping based on first, all, or any validation metrics via `--early-stopping-on`
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- Compute 8.6 support if using CUDA>=11.1
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- Support for RMSNorm as drop-in replace for LayerNorm from `Biao Zhang; Rico Sennrich (2019). Root Mean Square Layer Normalization`. Enabled in Transformer model via `--transformer-postprocess dar` instead of `dan`.
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- Extend suppression of unwanted output symbols, specifically "\n" from default vocabulary if generated by SentencePiece with byte-fallback. Deactivates with --allow-special
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- Allow for fine-grained CPU intrinsics overrides when BUILD_ARCH != native e.g. -DBUILD_ARCH=x86-64 -DCOMPILE_AVX512=off
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- Adds custom bias epilogue kernel.
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- Adds support for fusing relu and bias addition into gemms when using cuda 11.
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- Better suppression of unwanted output symbols, specifically "\n" from SentencePiece with byte-fallback. Can be deactivated with --allow-special
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- Display decoder time statistics with marian-decoder --stat-freq 10 ...
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- Support for MS-internal binary shortlist
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- Local/global sharding with MPI training via `--sharding local`
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- fp16 support for factors.
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- Correct training with fp16 via `--fp16`.
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- Dynamic cost-scaling with `--cost-scaling`.
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- Dynamic gradient-scaling with `--dynamic-gradient-scaling`.
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- Add unit tests for binary files.
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- Fix compilation with OMP
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- Added `--model-mmap` option to enable mmap loading for CPU-based translation
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- Compute aligned memory sizes using exact sizing
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- Support for loading lexical shortlist from a binary blob
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- Integrate a shortlist converter (which can convert a text lexical shortlist to a binary shortlist) into marian-conv with --shortlist option
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### Fixed
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- Fix AVX2 and AVX512 detection on MacOS
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- Add GCC11 support into FBGEMM
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- Added pragma to ignore unused-private-field error on elementType_ on macOS
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- Do not set guided alignments for case augmented data if vocab is not factored
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- Various fixes to enable LSH in Quicksand
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- Added support to MPIWrappest::bcast (and similar) for count of type size_t
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- Adding new validation metrics when training is restarted and --reset-valid-stalled is used
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- Missing depth-scaling in transformer FFN
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- Fixed an issue when loading intgemm16 models from unaligned memory.
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- Fix building marian with gcc 9.3+ and FBGEMM
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- Find MKL installed under Ubuntu 20.04 via apt-get
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- Support for CUDA 11.
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- General improvements and fixes for MPI handling, was essentially non-functional before (syncing, random seeds, deadlocks during saving, validation etc.)
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- Allow to compile -DUSE_MPI=on with -DUSE_STATIC_LIBS=on although MPI gets still linked dynamically since it has so many dependencies.
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- Fix building server with Boost 1.75
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- Missing implementation for cos/tan expression operator
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- Fixed loading binary models on architectures where `size_t` != `uint64_t`.
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- Missing float template specialisation for elem::Plus
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- Broken links to MNIST data sets
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- Enforce validation for the task alias in training mode.
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### Changed
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- MacOS marian uses Apple Accelerate framework by default, as opposed to openblas/mkl.
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- Optimize LSH for speed by treating is as a shortlist generator. No option changes in decoder
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- Set REQUIRED_BIAS_ALIGNMENT = 16 in tensors/gpu/prod.cpp to avoid memory-misalignment on certain Ampere GPUs.
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- For BUILD_ARCH != native enable all intrinsics types by default, can be disabled like this: -DCOMPILE_AVX512=off
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- Moved FBGEMM pointer to commit c258054 for gcc 9.3+ fix
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- Change compile options a la -DCOMPILE_CUDA_SM35 to -DCOMPILE_KEPLER, -DCOMPILE_MAXWELL,
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-DCOMPILE_PASCAL, -DCOMPILE_VOLTA, -DCOMPILE_TURING and -DCOMPILE_AMPERE
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- Disable -DCOMPILE_KEPLER, -DCOMPILE_MAXWELL by default.
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- Dropped support for legacy graph groups.
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- Developer documentation framework based on Sphinx+Doxygen+Breathe+Exhale
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- Expresion graph documentation (#788)
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- Graph operators documentation (#801)
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- Remove unused variable from expression graph
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- Factor groups and concatenation: doc/factors.md
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## [1.10.0] - 2021-02-06
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### Added
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- Added `intgemm8(ssse3|avx|avx512)?`, `intgemm16(sse2|avx|avx512)?` types to marian-conv with uses intgemm backend. Types intgemm8 and intgemm16 are hardware-agnostic, the other ones hardware-specific.
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- Shortlist is now always multiple-of-eight.
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- Added intgemm 8/16bit integer binary architecture agnostic format.
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- Add --train-embedder-rank for fine-tuning any encoder(-decoder) model for multi-lingual similarity via softmax-margin loss
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- Add --logical-epoch that allows to redefine the displayed epoch counter as a multiple of n data epochs, updates or labels. Also allows to define width of fractional part with second argument.
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- Add --metrics chrf for computing ChrF according to https://www.aclweb.org/anthology/W15-3049/ and SacreBLEU reference implementation
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- Add --after option which is meant to replace --after-batches and --after-epochs and can take label based criteria
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- Add --transformer-postprocess-top option to enable correctly normalized prenorm behavior
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- Add --task transformer-base-prenorm and --task transformer-big-prenorm
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- Turing and Ampere GPU optimisation support, if the CUDA version supports it.
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- Printing word-level scores in marian-scorer
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- Optimize LayerNormalization on CPU by 6x through vectorization (ffast-math) and fixing performance regression introduced with strides in 77a420
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- Decoding multi-source models in marian-server with --tsv
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- GitHub workflows on Ubuntu, Windows, and MacOS
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- LSH indexing to replace short list
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- ONNX support for transformer models (very experimental)
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- Add topk operator like PyTorch's topk
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- Use *cblas_sgemm_batch* instead of a for loop of *cblas_sgemm* on CPU as the batched_gemm implementation
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- Supporting relative paths in shortlist and sqlite options
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- Training and scoring from STDIN
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- Support for reading from TSV files from STDIN and other sources during training
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and translation with options --tsv and --tsv-fields n.
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- Internal optional parameter in n-best list generation that skips empty hypotheses.
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- Quantized training (fixed point or log-based quantization) with --quantize-bits N command
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- Support for using Apple Accelerate as the BLAS library
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### Fixed
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- Segfault of spm_train when compiled with -DUSE_STATIC_LIBS=ON seems to have gone away with update to newer SentencePiece version.
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- Fix bug causing certain reductions into scalars to be 0 on the GPU backend. Removed unnecessary warp shuffle instructions.
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- Do not apply dropout in embeddings layers during inference with dropout-src/trg
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- Print "server is listening on port" message after it is accepting connections
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- Fix compilation without BLAS installed
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- Providing a single value to vector-like options using the equals sign, e.g. --models=model.npz
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- Fix quiet-translation in marian-server
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- CMake-based compilation on Windows
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- Fix minor issues with compilation on MacOS
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- Fix warnings in Windows MSVC builds using CMake
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- Fix building server with Boost 1.72
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- Make mini-batch scaling depend on mini-batch-words and not on mini-batch-words-ref
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- In concatenation make sure that we do not multiply 0 with nan (which results in nan)
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- Change Approx.epsilon(0.01) to Approx.margin(0.001) in unit tests. Tolerance is now
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absolute and not relative. We assumed incorrectly that epsilon is absolute tolerance.
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- Fixed bug in finding .git/logs/HEAD when Marian is a submodule in another project.
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- Properly record cmake variables in the cmake build directory instead of the source tree.
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- Added default "none" for option shuffle in BatchGenerator, so that it works in executables where shuffle is not an option.
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- Added a few missing header files in shortlist.h and beam_search.h.
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- Improved handling for receiving SIGTERM during training. By default, SIGTERM triggers 'save (now) and exit'. Prior to this fix, batch pre-fetching did not check for this sigal, potentially delaying exit considerably. It now pays attention to that. Also, the default behaviour of save-and-exit can now be disabled on the command line with --sigterm exit-immediately.
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- Fix the runtime failures for FASTOPT on 32-bit builds (wasm just happens to be 32-bit) because it uses hashing with an inconsistent mix of uint64_t and size_t.
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- fix beam_search ABORT_IF(beamHypIdx >= beam.size(), "Out of bounds beamHypIdx??"); when enable openmp and OMP_NUM_THREADS > 1
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### Changed
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- Remove `--clip-gemm` which is obsolete and was never used anyway
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- Removed `--optimize` switch, instead we now determine compute type based on binary model.
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- Updated SentencePiece repository to version 8336bbd0c1cfba02a879afe625bf1ddaf7cd93c5 from https://github.com/google/sentencepiece.
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- Enabled compilation of SentencePiece by default since no dependency on protobuf anymore.
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- Changed default value of --sentencepiece-max-lines from 10000000 to 2000000 since apparently the new version doesn't sample automatically anymore (Not quite clear how that affects quality of the vocabulary).
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- Change mini-batch-fit search stopping criterion to stop at ideal binary search threshold.
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- --metric bleu now always detokenizes SacreBLEU-style if a vocabulary knows how to, use bleu-segmented to compute BLEU on word ids. bleu-detok is now a synonym for bleu.
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- Move label-smoothing computation into Cross-entropy node
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- Move Simple-WebSocket-Server to submodule
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- Python scripts start with #!/usr/bin/env python3 instead of python
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- Changed compile flags -Ofast to -O3 and remove --ffinite-math
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- Moved old graph groups to depracated folder
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- Make cublas and cusparse handle inits lazy to save memory when unused
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- Replaced exception-based implementation for type determination in FastOpt::makeScalar
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## [1.9.0] - 2020-03-10
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### Added
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- An option to print cached variables from CMake
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- Add support for compiling on Mac (and clang)
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- An option for resetting stalled validation metrics
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- Add CMAKE options to disable compilation for specific GPU SM types
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- An option to print word-level translation scores
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- An option to turn off automatic detokenization from SentencePiece
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- Separate quantization types for 8-bit FBGEMM for AVX2 and AVX512
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- Sequence-level unliklihood training
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- Allow file name templated valid-translation-output files
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- Support for lexical shortlists in marian-server
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- Support for 8-bit matrix multiplication with FBGEMM
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- CMakeLists.txt now looks for SSE 4.2
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- Purging of finished hypotheses during beam-search. A lot faster for large batches.
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- Faster option look-up, up to 20-30% faster translation
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- Added --cite and --authors flag
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- Added optional support for ccache
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- Switch to change abort to exception, only to be used in library mode
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- Support for 16-bit packed models with FBGEMM
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- Multiple separated parameter types in ExpressionGraph, currently inference-only
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- Safe handling of sigterm signal
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- Automatic vectorization of elementwise operations on CPU for tensors dims that
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are divisible by 4 (AVX) and 8 (AVX2)
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- Replacing std::shared_ptr<T> with custom IntrusivePtr<T> for small objects like
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Tensors, Hypotheses and Expressions.
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- Fp16 inference working for translation
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- Gradient-checkpointing
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### Fixed
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- Replace value for INVALID_PATH_SCORE with std::numer_limits<float>::lowest()
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to avoid overflow with long sequences
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- Break up potential circular references for GraphGroup*
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- Fix empty source batch entries with batch purging
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- Clear RNN chache in transformer model, add correct hash functions to nodes
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- Gather-operation for all index sizes
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- Fix word weighting with max length cropping
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- Fixed compilation on CPUs without support for AVX
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- FastOpt now reads "n" and "y" values as strings, not as boolean values
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- Fixed multiple reduction kernels on GPU
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- Fixed guided-alignment training with cross-entropy
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- Replace IntrusivePtr with std::uniq_ptr in FastOpt, fixes random segfaults
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due to thread-non-safty of reference counting.
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- Make sure that items are 256-byte aligned during saving
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- Make explicit matmul functions respect setting of cublasMathMode
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- Fix memory mapping for mixed paramter models
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- Removed naked pointer and potential memory-leak from file_stream.{cpp,h}
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- Compilation for GCC >= 7 due to exception thrown in destructor
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- Sort parameters by lexicographical order during allocation to ensure consistent
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memory-layout during allocation, loading, saving.
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- Output empty line when input is empty line. Previous behavior might result in
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hallucinated outputs.
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- Compilation with CUDA 10.1
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### Changed
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- Combine two for-loops in nth_element.cpp on CPU
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- Revert LayerNorm eps to old position, i.e. sigma' = sqrt(sigma^2 + eps)
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- Downgrade NCCL to 2.3.7 as 2.4.2 is buggy (hangs with larger models)
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- Return error signal on SIGTERM
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- Dropped support for CUDA 8.0, CUDA 9.0 is now minimal requirement
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- Removed autotuner for now, will be switched back on later
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- Boost depdendency is now optional and only required for marian_server
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- Dropped support for g++-4.9
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- Simplified file stream and temporary file handling
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- Unified node intializers, same function API.
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- Remove overstuff/understuff code
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## [1.8.0] - 2019-09-04
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### Added
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- Alias options and new --task option
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- Automatic detection of CPU intrisics when building with -arch=native
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- First version of BERT-training and BERT-classifier, currently not compatible with TF models
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- New reduction operators
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- Use Cmake's ExternalProject to build NCCL and potentially other external libs
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- Code for Factored Vocabulary, currently not usable yet without outside tools
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### Fixed
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- Issue with relative paths in automatically generated decoder config files
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- Bug with overlapping CXX flags and building spm_train executable
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- Compilation with gcc 8
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- Overwriting and unsetting vector options
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- Windows build with recent changes
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- Bug with read-ahead buffer
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- Handling of "dump-config: false" in YAML config
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- Errors due to warnings
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- Issue concerning failed saving with single GPU training and --sync-sgd option.
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- NaN problem when training with Tensor Cores on Volta GPUs
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- Fix pipe-handling
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- Fix compilation with GCC 9.1
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- Fix CMake build types
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### Changed
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- Error message when using left-to-right and right-to-left models together in ensembles
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- Regression tests included as a submodule
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- Update NCCL to 2.4.2
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- Add zlib source to Marian's source tree, builds now as object lib
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- -DUSE_STATIC_LIBS=on now also looks for static versions of CUDA libraries
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- Include NCCL build from github.com/marian-nmt/nccl and compile within source tree
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- Set nearly all warnings as errors for Marian's own targets. Disable warnings for 3rd party
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- Refactored beam search
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## [1.7.0] - 2018-11-27
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### Added
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- Word alignment generation in scorer
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- Attention output generation in decoder and scorer with `--alignment soft`
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- Support for SentencePiece vocabularies and run-time segmentation/desegmentation
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- Support for SentencePiece vocabulary training during model training
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- Group training files by filename when creating vocabularies for joint vocabularies
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- Updated examples
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- Synchronous multi-node training (early version)
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### Fixed
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- Delayed output in line-by-line translation
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### Changed
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- Generated word alignments include alignments for target EOS tokens
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- Boost::program_options has been replaced by another CLI library
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- Replace boost::file_system with Pathie
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- Expansion of unambiguous command-line arguments is no longer supported
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## [1.6.0] - 2018-08-08
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### Added
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- Faster training (20-30%) by optimizing gradient popagation of biases
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- Returning Moses-style hard alignments during decoding single models,
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ensembles and n-best lists
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- Hard alignment extraction strategy taking source words that have the
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attention value greater than the threshold
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- Refactored sync sgd for easier communication and integration with NCCL
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- Smaller memory-overhead for sync-sgd
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- NCCL integration (version 2.2.13)
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- New binary format for saving/load of models, can be used with _*.bin_
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extension (can be memory mapped)
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- Memory-mapping of graphs for inferece with `ExpressionGraph::mmap(const void*
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ptr)` function. (assumes _*.bin_ model is mapped or in buffer)
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- Added SRU (--dec-cell sru) and ReLU (--dec-cell relu) cells to inventory of
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RNN cells
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- RNN auto-regression layers in transformer (`--transformer-decoder-autreg
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rnn`), work with gru, lstm, tanh, relu, sru cells
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- Recurrently stacked layers in transformer (`--transformer-tied-layers 1 1 1 2
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2 2` means 6 layers with 1-3 and 4-6 tied parameters, two groups of
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parameters)
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- Seamless training continuation with exponential smoothing
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### Fixed
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- A couple of bugs in "selection" (transpose, shift, cols, rows) operators
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during back-prob for a very specific case: one of the operators is the first
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operator after a branch, in that case gradient propgation might be
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interrupted. This did not affect any of the existing models as such a case
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was not present, but might have caused future models to not train properly
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- Bug in mini-batch-fit, tied embeddings would result in identical embeddings
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in fake source and target batch. Caused under-estimation of memory usage and
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re-allocation
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## [1.5.0] - 2018-06-17
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### Added
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- Average Attention Networks for Transformer model
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- 16-bit matrix multiplication on CPU
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- Memoization for constant nodes for decoding
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- Autotuning for decoding
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### Fixed
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- GPU decoding optimizations, about 2x faster decoding of transformer models
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- Multi-node MPI-based training on GPUs
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## [1.4.0] - 2018-03-13
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### Added
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- Data weighting with `--data-weighting` at sentence or word level
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- Persistent SQLite3 corpus storage with `--sqlite file.db`
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- Experimental multi-node asynchronous training
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- Restoring optimizer and training parameters such as learning rate, validation
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results, etc.
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- Experimental multi-CPU training/translation/scoring with `--cpu-threads=N`
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- Restoring corpus iteration after training is restarted
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- N-best-list scoring in marian-scorer
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### Fixed
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- Deterministic data shuffling with specific seed for SQLite3 corpus storage
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- Mini-batch fitting with binary search for faster fitting
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- Better batch packing due to sorting
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## [1.3.1] - 2018-02-04
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### Fixed
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- Missing final validation when done with training
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- Differing summaries for marian-scorer when used with multiple GPUs
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## [1.3.0] - 2018-01-24
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### Added
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- SQLite3 based corpus storage for on-disk shuffling etc. with `--sqlite`
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|
- Asynchronous maxi-batch preloading
|
|
- Using transpose in SGEMM to tie embeddings in output layer
|
|
|
|
## [1.2.1] - 2018-01-19
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|
|
|
### Fixed
|
|
- Use valid-mini-batch size during validation with "translation" instead of
|
|
mini-batch
|
|
- Normalize gradients with multi-gpu synchronous SGD
|
|
- Fix divergence between saved models and validated models in asynchronous SGD
|
|
|
|
## [1.2.0] - 2018-01-13
|
|
|
|
### Added
|
|
- Option `--pretrained-model` to be used for network weights initialization
|
|
with a pretrained model
|
|
- Version number saved in the model file
|
|
- CMake option `-DCOMPILE_SERVER=ON`
|
|
- Right-to-left training, scoring, decoding with `--right-left`
|
|
|
|
### Fixed
|
|
- Fixed marian-server compilation with Boost 1.66
|
|
- Fixed compilation on g++-4.8.4
|
|
- Fixed compilation without marian-server if openssl is not available
|
|
|
|
## [1.1.3] - 2017-12-06
|
|
|
|
### Added
|
|
- Added back gradient-dropping
|
|
|
|
### Fixed
|
|
- Fixed parameters initialization for `--tied-embeddings` during translation
|
|
|
|
## [1.1.2] - 2017-12-05
|
|
|
|
### Fixed
|
|
- Fixed ensembling with language model and batched decoding
|
|
- Fixed attention reduction kernel with large matrices (added missing
|
|
`syncthreads()`), which should fix stability with large batches and beam-size
|
|
during batched decoding
|
|
|
|
## [1.1.1] - 2017-11-30
|
|
|
|
### Added
|
|
- Option `--max-length-crop` to be used together with `--max-length N` to crop
|
|
sentences to length N rather than omitting them.
|
|
- Experimental model with convolution over input characters
|
|
|
|
### Fixed
|
|
- Fixed a number of bugs for vocabulary and directory handling
|
|
|
|
## [1.1.0] - 2017-11-21
|
|
|
|
### Added
|
|
- Batched translation for all model types, significant translation speed-up
|
|
- Batched translation during validation with translation
|
|
- `--maxi-batch-sort` option for `marian-decoder`
|
|
- Support for CUBLAS_TENSOR_OP_MATH mode for cublas in cuda 9.0
|
|
- The "marian-vocab" tool to create vocabularies
|
|
|
|
## [1.0.0] - 2017-11-13
|
|
|
|
### Added
|
|
- Multi-gpu validation, scorer and in-training translation
|
|
- summary-mode for scorer
|
|
- New "transformer" model based on [Attention is all you
|
|
need](https://arxiv.org/abs/1706.03762)
|
|
- Options specific for the transformer model
|
|
- Linear learning rate warmup with and without initial value
|
|
- Cyclic learning rate warmup
|
|
- More options for learning rate decay, including: optimizer history reset,
|
|
repeated warmup
|
|
- Continuous inverted square root decay of learning (`--lr-decay-inv-sqrt`)
|
|
rate based on number of updates
|
|
- Exposed optimizer parameters (e.g. momentum etc. for Adam)
|
|
- Version of deep RNN-based models compatible with Nematus (`--type nematus`)
|
|
- Synchronous SGD training for multi-gpu (enable with `--sync-sgd`)
|
|
- Dynamic construction of complex models with different encoders and decoders,
|
|
currently only available through the C++ API
|
|
- Option `--quiet` to suppress output to stderr
|
|
- Option to choose different variants of optimization criterion: mean
|
|
cross-entropy, perplexity, cross-entropy sum
|
|
- In-process translation for validation, uses the same memory as training
|
|
- Label Smoothing
|
|
- CHANGELOG.md
|
|
- CONTRIBUTING.md
|
|
- Swish activation function default for Transformer
|
|
(https://arxiv.org/pdf/1710.05941.pdf)
|
|
|
|
### Changed
|
|
- Changed shape organization to follow numpy.
|
|
- Changed option `--moving-average` to `--exponential-smoothing` and inverted
|
|
formula to `s_t = (1 - \alpha) * s_{t-1} + \alpha * x_t`, `\alpha` is now
|
|
`1-e4` by default
|
|
- Got rid of thrust for compile-time mathematical expressions
|
|
- Changed boolean option `--normalize` to `--normalize [arg=1] (=0)`. New
|
|
behaviour is backwards-compatible and can also be specified as
|
|
`--normalize=0.6`
|
|
- Renamed "s2s" binary to "marian-decoder"
|
|
- Renamed "rescorer" binary to "marian-scorer"
|
|
- Renamed "server" binary to "marian-server"
|
|
- Renamed option name `--dynamic-batching` to `--mini-batch-fit`
|
|
- Unified cross-entropy-based validation, supports now perplexity and other CE
|
|
- Changed `--normalize (bool)` to `--normalize (float)arg`, allow to change
|
|
length normalization weight as `score / pow(length, arg)`
|
|
|
|
### Removed
|
|
- Temporarily removed gradient dropping (`--drop-rate X`) until refactoring.
|