"""
The ``mlflow.spacy`` module provides an API for logging and loading spaCy models.
This module exports spacy models with the following flavors:
spaCy (native) format
This is the main flavor that can be loaded back into spaCy.
:py:mod:`mlflow.pyfunc`
Produced for use by generic pyfunc-based deployment tools and batch inference, this
flavor is created only if spaCy's model pipeline has at least one
`TextCategorizer <https://spacy.io/api/textcategorizer>`_.
"""
import logging
import os
from typing import Any, Dict, Optional
import pandas as pd
import yaml
import mlflow
from mlflow import pyfunc
from mlflow.exceptions import MlflowException
from mlflow.models import Model, ModelSignature
from mlflow.models.model import MLMODEL_FILE_NAME
from mlflow.models.signature import _infer_signature_from_input_example
from mlflow.models.utils import ModelInputExample, _save_example
from mlflow.tracking.artifact_utils import _download_artifact_from_uri
from mlflow.utils.docstring_utils import LOG_MODEL_PARAM_DOCS, format_docstring
from mlflow.utils.environment import (
_CONDA_ENV_FILE_NAME,
_CONSTRAINTS_FILE_NAME,
_PYTHON_ENV_FILE_NAME,
_REQUIREMENTS_FILE_NAME,
_mlflow_conda_env,
_process_conda_env,
_process_pip_requirements,
_PythonEnv,
_validate_env_arguments,
)
from mlflow.utils.file_utils import get_total_file_size, write_to
from mlflow.utils.model_utils import (
_add_code_from_conf_to_system_path,
_get_flavor_configuration,
_validate_and_copy_code_paths,
_validate_and_prepare_target_save_path,
)
from mlflow.utils.requirements_utils import _get_pinned_requirement
FLAVOR_NAME = "spacy"
_MODEL_DATA_SUBPATH = "model.spacy"
_logger = logging.getLogger(__name__)
[docs]def get_default_pip_requirements():
"""
Returns:
A list of default pip requirements for MLflow Models produced by this flavor.
Calls to :func:`save_model()` and :func:`log_model()` produce a pip environment
that, at minimum, contains these requirements.
"""
return [_get_pinned_requirement("spacy")]
[docs]def get_default_conda_env():
"""
Returns:
The default Conda environment for MLflow Models produced by calls to
:func:`save_model()` and :func:`log_model()`.
"""
return _mlflow_conda_env(additional_pip_deps=get_default_pip_requirements())
[docs]@format_docstring(LOG_MODEL_PARAM_DOCS.format(package_name=FLAVOR_NAME))
def save_model(
spacy_model,
path,
conda_env=None,
code_paths=None,
mlflow_model=None,
signature: ModelSignature = None,
input_example: ModelInputExample = None,
pip_requirements=None,
extra_pip_requirements=None,
metadata=None,
):
"""Save a spaCy model to a path on the local file system.
Args:
spacy_model: spaCy model to be saved.
path: Local path where the model is to be saved.
conda_env: {{ conda_env }}
code_paths: {{ code_paths }}
mlflow_model: :py:mod:`mlflow.models.Model` this flavor is being added to.
signature: :py:class:`ModelSignature <mlflow.models.ModelSignature>`
describes model input and output :py:class:`Schema <mlflow.types.Schema>`.
The model signature can be :py:func:`inferred <mlflow.models.infer_signature>`
from datasets with valid model input (e.g. the training dataset with target
column omitted) and valid model output (e.g. model predictions generated on
the training dataset), for example:
.. code-block:: python
from mlflow.models import infer_signature
train = df.drop_column("target_label")
predictions = ... # compute model predictions
signature = infer_signature(train, predictions)
input_example: {{ input_example }}
pip_requirements: {{ pip_requirements }}
extra_pip_requirements: {{ extra_pip_requirements }}
metadata: {{ metadata }}
"""
import spacy
_validate_env_arguments(conda_env, pip_requirements, extra_pip_requirements)
path = os.path.abspath(path)
_validate_and_prepare_target_save_path(path)
model_data_subpath = _MODEL_DATA_SUBPATH
model_data_path = os.path.join(path, model_data_subpath)
os.makedirs(model_data_path)
code_dir_subpath = _validate_and_copy_code_paths(code_paths, path)
if mlflow_model is None:
mlflow_model = Model()
saved_example = _save_example(mlflow_model, input_example, path)
if signature is None and saved_example is not None:
wrapped_model = _SpacyModelWrapper(spacy_model)
signature = _infer_signature_from_input_example(saved_example, wrapped_model)
if signature is not None:
mlflow_model.signature = signature
if metadata is not None:
mlflow_model.metadata = metadata
# Save spacy-model
spacy_model.to_disk(path=model_data_path)
# Save the pyfunc flavor if at least one text categorizer in spaCy pipeline
if any(
isinstance(pipe_component[1], spacy.pipeline.TextCategorizer)
for pipe_component in spacy_model.pipeline
):
pyfunc.add_to_model(
mlflow_model,
loader_module="mlflow.spacy",
data=model_data_subpath,
conda_env=_CONDA_ENV_FILE_NAME,
python_env=_PYTHON_ENV_FILE_NAME,
code=code_dir_subpath,
)
else:
_logger.warning(
"Generating only the spacy flavor for the provided spacy model. This means the model "
"can be loaded back via `mlflow.spacy.load_model`, but cannot be loaded back using "
"pyfunc APIs like `mlflow.pyfunc.load_model` or via the `mlflow models` CLI commands. "
"MLflow will only generate the pyfunc flavor for spacy models containing a pipeline "
"component that is an instance of spacy.pipeline.TextCategorizer."
)
mlflow_model.add_flavor(
FLAVOR_NAME, spacy_version=spacy.__version__, data=model_data_subpath, code=code_dir_subpath
)
if size := get_total_file_size(path):
mlflow_model.model_size_bytes = size
mlflow_model.save(os.path.join(path, MLMODEL_FILE_NAME))
if conda_env is None:
if pip_requirements is None:
default_reqs = get_default_pip_requirements()
# To ensure `_load_pyfunc` can successfully load the model during the dependency
# inference, `mlflow_model.save` must be called beforehand to save an MLmodel file.
inferred_reqs = mlflow.models.infer_pip_requirements(
model_data_path,
FLAVOR_NAME,
fallback=default_reqs,
)
default_reqs = sorted(set(inferred_reqs).union(default_reqs))
else:
default_reqs = None
conda_env, pip_requirements, pip_constraints = _process_pip_requirements(
default_reqs,
pip_requirements,
extra_pip_requirements,
)
else:
conda_env, pip_requirements, pip_constraints = _process_conda_env(conda_env)
with open(os.path.join(path, _CONDA_ENV_FILE_NAME), "w") as f:
yaml.safe_dump(conda_env, stream=f, default_flow_style=False)
# Save `constraints.txt` if necessary
if pip_constraints:
write_to(os.path.join(path, _CONSTRAINTS_FILE_NAME), "\n".join(pip_constraints))
# Save `requirements.txt`
write_to(os.path.join(path, _REQUIREMENTS_FILE_NAME), "\n".join(pip_requirements))
_PythonEnv.current().to_yaml(os.path.join(path, _PYTHON_ENV_FILE_NAME))
[docs]@format_docstring(LOG_MODEL_PARAM_DOCS.format(package_name=FLAVOR_NAME))
def log_model(
spacy_model,
artifact_path,
conda_env=None,
code_paths=None,
registered_model_name=None,
signature: ModelSignature = None,
input_example: ModelInputExample = None,
pip_requirements=None,
extra_pip_requirements=None,
metadata=None,
**kwargs,
):
"""Log a spaCy model as an MLflow artifact for the current run.
Args:
spacy_model: spaCy model to be saved.
artifact_path: Run-relative artifact path.
conda_env: {{ conda_env }}
code_paths: {{ code_paths }}
registered_model_name: If given, create a model version under
``registered_model_name``, also creating a registered model if one
with the given name does not exist.
signature: :py:class:`ModelSignature <mlflow.models.ModelSignature>`
describes model input and output :py:class:`Schema <mlflow.types.Schema>`.
The model signature can be :py:func:`inferred <mlflow.models.infer_signature>`
from datasets with valid model input (e.g. the training dataset with target
column omitted) and valid model output (e.g. model predictions generated on
the training dataset), for example:
.. code-block:: python
from mlflow.models import infer_signature
train = df.drop_column("target_label")
predictions = ... # compute model predictions
signature = infer_signature(train, predictions)
input_example: {{ input_example }}
pip_requirements: {{ pip_requirements }}
extra_pip_requirements: {{ extra_pip_requirements }}
metadata: {{ metadata }}
kwargs: kwargs to pass to ``spacy.save_model`` method.
Returns:
A :py:class:`ModelInfo <mlflow.models.model.ModelInfo>` instance that contains the
metadata of the logged model.
"""
return Model.log(
artifact_path=artifact_path,
flavor=mlflow.spacy,
registered_model_name=registered_model_name,
spacy_model=spacy_model,
conda_env=conda_env,
code_paths=code_paths,
signature=signature,
input_example=input_example,
pip_requirements=pip_requirements,
extra_pip_requirements=extra_pip_requirements,
metadata=metadata,
**kwargs,
)
def _load_model(path):
import spacy
path = os.path.abspath(path)
return spacy.load(path)
class _SpacyModelWrapper:
def __init__(self, spacy_model):
self.spacy_model = spacy_model
def get_raw_model(self):
"""
Returns the underlying model.
"""
return self.spacy_model
def predict(
self,
dataframe,
params: Optional[Dict[str, Any]] = None,
):
"""Only works for predicting using text categorizer.
Not suitable for other pipeline components (e.g: parser)
Args:
dataframe: pandas dataframe containing texts to be categorized
expected shape is (n_rows,1 column)
params: Additional parameters to pass to the model for inference.
Returns:
dataframe with predictions
"""
if len(dataframe.columns) != 1:
raise MlflowException("Shape of input dataframe must be (n_rows, 1column)")
return pd.DataFrame(
{"predictions": dataframe.iloc[:, 0].apply(lambda text: self.spacy_model(text).cats)}
)
def _load_pyfunc(path):
"""Load PyFunc implementation. Called by ``pyfunc.load_model``.
Args:
path: Local filesystem path to the MLflow Model with the ``spacy`` flavor.
"""
return _SpacyModelWrapper(_load_model(path))
[docs]def load_model(model_uri, dst_path=None):
"""Load a spaCy model from a local file (if ``run_id`` is ``None``) or a run.
Args:
model_uri: The location, in URI format, of the MLflow model. For example:
- ``/Users/me/path/to/local/model``
- ``relative/path/to/local/model``
- ``s3://my_bucket/path/to/model``
- ``runs:/<mlflow_run_id>/run-relative/path/to/model``
- ``models:/<model_name>/<model_version>``
- ``models:/<model_name>/<stage>``
For more information about supported URI schemes, see
`Referencing Artifacts <https://www.mlflow.org/docs/latest/concepts.html#
artifact-locations>`_.
dst_path: The local filesystem path to which to download the model artifact.
This directory must already exist. If unspecified, a local output
path will be created.
Returns:
A spaCy loaded model
"""
local_model_path = _download_artifact_from_uri(artifact_uri=model_uri, output_path=dst_path)
flavor_conf = _get_flavor_configuration(model_path=local_model_path, flavor_name=FLAVOR_NAME)
_add_code_from_conf_to_system_path(local_model_path, flavor_conf)
# Flavor configurations for models saved in MLflow version <= 0.8.0 may not contain a
# `data` key; in this case, we assume the model artifact path to be `model.spacy`
spacy_model_file_path = os.path.join(local_model_path, flavor_conf.get("data", "model.spacy"))
return _load_model(path=spacy_model_file_path)