MDescriptor
MDescriptor is a batch-oriented periodic atomic-descriptor library. The numerical kernels are implemented in C++17 and all Python descriptors share one input/result/lifecycle contract.
MDescriptor 是面向批量周期结构的原子描述符库。数值核心使用 C++17;所有 Python 描述符共享统一的输入、结果和生命周期契约。
Layout / 布局
The public namespace is intentionally small:
src/mdescriptor/ installable package
src/mdescriptor/core/ Descriptor, StructureBatch, DescriptorResult
src/mdescriptor/descriptors/
standalone/ no model required (matrices/, many_body/, local/, rotational/)
model_backed/ graph seam plus NEP, DPA4, DPA4C
src/mdescriptor/models/assets/ packaged, hash-verified model resources
standalone descriptors never require a model file. model_backed descriptors
always resolve a model resource (a packaged default or an explicit model=
path). There are no network downloads or implicit model discovery.
standalone 中的描述符不需要模型文件;model_backed 中的 NEP、DPA4、DPA4C
始终解析模型资源(内置默认模型或显式 model= 路径)。不会联网下载,也不会
扫描目录自动发现模型。
Installation / 安装
The base package requires Python 3.10+, NumPy and array-api-compat. ASE is
optional and is only needed for StructureBatch.from_ase or direct ASE input.
Sparse output is provided as SciPy CSR by the optional sparse extra.
基础包需要 Python 3.10+、NumPy 和 array-api-compat。ASE 只在使用
StructureBatch.from_ase 或直接传入 ASE 对象时需要;稀疏输出由可选的
sparse extra 提供。
python -m pip install .
python -m pip install ".[ase]"
python -m pip install ".[sparse]"
DPA4 and DPA4C are CPU-only pure-NumPy implementations. Their official .pt
checkpoints are parsed by the bundled restricted reader without importing or
installing Torch. No network model download is performed.
Input contract / 输入契约
import numpy as np
from mdescriptor import StructureBatch
batch = StructureBatch(
numbers=np.array([1, 8], dtype=np.int32),
positions=np.array([[0., 0., 0.], [1., 0., 0.]]),
cells=np.eye(3, dtype=np.float64)[None] * 12,
pbc=np.ones((1, 3), dtype=np.int32),
offsets=np.array([0, 2], dtype=np.int64),
ids=("water-0",),
)
StructureBatch validates contiguous arrays, finite positions/cells,
nonsingular cells, positive atomic numbers, monotonic offsets and fully
periodic pbc == (1, 1, 1). ASE conversion is available through
StructureBatch.from_ase(...).
Descriptor API / 描述符 API
Algorithm classes live under mdescriptor.descriptors and use canonical names:
from mdescriptor.descriptors import SOAP
soap = SOAP(species=[1, 8], r_cut=4.5, n_max=4, l_max=3, average="off")
result = soap.compute(batch)
assert result.level == "atom"
assert result.values.shape == (batch.atoms, soap.feature_count)
assert len(result.labels) == result.values.shape[1]
with SOAP(species=[1, 8], r_cut=4.5, n_max=2, l_max=2) as descriptor:
result = descriptor.compute(batch)
Every descriptor has idempotent close(), a closed property and synchronous
context-manager support. Computing after close raises ClosedDescriptorError.
Instances are synchronous and not promised to be thread-safe.
每个描述符都提供幂等 close()、closed 属性和同步上下文管理器;关闭后计算
会抛出 ClosedDescriptorError。实例是同步的,不承诺线程安全。
DescriptorResult contains values, level (atom, structure, or pair),
structure_ids, row offsets, stable labels, JSON-safe metadata, per-row
samples, and feature_count. The descriptor itself also retains the latest
JSON-safe metadata and its configuration after close(). The standard shapes are (N, F), (S, F),
and (P, F) for atom, structure and pair outputs respectively.
Registry / 注册表
Built-ins come from one explicit immutable specification list. Imports are lazy and no decorator or filesystem scan is used.
import mdescriptor
from mdescriptor.descriptors import SOAP
print(mdescriptor.list_descriptors())
soap = SOAP(species=[1, 8], r_cut=4.5, n_max=2, l_max=2)
rebuilt = mdescriptor.create_descriptor(soap.configuration)
child = mdescriptor.DescriptorRegistry(parent=mdescriptor.builtin_registry)
child.register(my_spec)
The built-in list separates AssetPolicy.NONE, OPTIONAL (for example MTP
potentials), and REQUIRED (NEP/DPA4/DPA4C). The root package exposes stable
contracts, registry functions and errors only; algorithm implementations are
not re-exported from the root.
Model resources / 模型资源
ModelResource, ModelResolver, LoadedModel and ModelSession are the
shared model-resource seam. Resolution is explicit, local and checksum-aware:
from pathlib import Path
from mdescriptor.descriptors import DPA4
from mdescriptor import ExecutionOptions
dpa4 = DPA4(
model=Path("/path/to/official-checkpoint.pt"),
execution=ExecutionOptions(device="cpu"),
)
result = dpa4.compute(batch)
The DPA4/DPA4C neural-network internals remain vendor/black-box adapters in this phase; they are intentionally isolated for a later dedicated DPA-series refactor.
Development / 开发
.venv/bin/python -m pip install -e . --no-build-isolation
.venv/bin/python -m pytest --import-mode=importlib tests -q
The extension is private (mdescriptor._native). C++ shared math and batch
helpers live in named headers under cpp/include/mdescriptor/detail/.
MDescriptor is licensed under the GNU General Public License v3.0; see LICENSE.
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