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openvino_inferencer.py
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openvino_inferencer.py
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"""OpenVINO Inferencer implementation."""
# Copyright (C) 2022-2024 Intel Corporation
# SPDX-License-Identifier: Apache-2.0
import logging
from importlib.util import find_spec
from pathlib import Path
from typing import TYPE_CHECKING, Any
import cv2
import numpy as np
from omegaconf import DictConfig
from PIL import Image
from anomalib import TaskType
from anomalib.data.utils.label import LabelName
from anomalib.utils.visualization import ImageResult
from .base_inferencer import Inferencer
logger = logging.getLogger("anomalib")
if find_spec("openvino") is not None:
import openvino as ov
if TYPE_CHECKING:
from openvino import CompiledModel
else:
logger.warning("OpenVINO is not installed. Please install OpenVINO to use OpenVINOInferencer.")
class OpenVINOInferencer(Inferencer):
"""OpenVINO implementation for the inference.
Args:
path (str | Path): Path to the openvino onnx, xml or bin file.
metadata (str | Path | dict, optional): Path to metadata file or a dict object defining the
metadata.
Defaults to ``None``.
device (str | None, optional): Device to run the inference on (AUTO, CPU, GPU, NPU).
Defaults to ``AUTO``.
task (TaskType | None, optional): Task type.
Defaults to ``None``.
config (dict | None, optional): Configuration parameters for the inference
Defaults to ``None``.
Examples:
Assume that we have an OpenVINO IR model and metadata files in the following structure:
.. code-block:: bash
$ tree weights
./weights
├── model.bin
├── model.xml
└── metadata.json
We could then create ``OpenVINOInferencer`` as follows:
>>> from anomalib.deploy.inferencers import OpenVINOInferencer
>>> inferencer = OpenVINOInferencer(
... path="weights/model.xml",
... metadata="weights/metadata.json",
... device="CPU",
... )
This will ensure that the model is loaded on the ``CPU`` device and the
metadata is loaded from the ``metadata.json`` file. To make a prediction,
we can simply call the ``predict`` method:
>>> prediction = inferencer.predict(image="path/to/image.jpg")
Alternatively we can also pass the image as a PIL image or numpy array:
>>> from PIL import Image
>>> image = Image.open("path/to/image.jpg")
>>> prediction = inferencer.predict(image=image)
>>> import numpy as np
>>> image = np.random.rand(224, 224, 3)
>>> prediction = inferencer.predict(image=image)
``prediction`` will be an ``ImageResult`` object containing the prediction
results. For example, to visualize the heatmap, we can do the following:
>>> from matplotlib import pyplot as plt
>>> plt.imshow(result.heatmap)
It is also possible to visualize the true and predicted masks if the
task is ``TaskType.SEGMENTATION``:
>>> plt.imshow(result.gt_mask)
>>> plt.imshow(result.pred_mask)
"""
def __init__(
self,
path: str | Path | tuple[bytes, bytes],
metadata: str | Path | dict | None = None,
device: str | None = "AUTO",
task: str | None = None,
config: dict | None = None,
) -> None:
self.device = device
self.config = config
self.input_blob, self.output_blob, self.model = self.load_model(path)
self.metadata = super()._load_metadata(metadata)
self.task = TaskType(task) if task else TaskType(self.metadata["task"])
def load_model(self, path: str | Path | tuple[bytes, bytes]) -> tuple[Any, Any, "CompiledModel"]:
"""Load the OpenVINO model.
Args:
path (str | Path | tuple[bytes, bytes]): Path to the onnx or xml and bin files
or tuple of .xml and .bin data as bytes.
Returns:
[tuple[str, str, ExecutableNetwork]]: Input and Output blob names
together with the Executable network.
"""
core = ov.Core()
# If tuple of bytes is passed
if isinstance(path, tuple):
model = core.read_model(model=path[0], weights=path[1])
else:
path = path if isinstance(path, Path) else Path(path)
if path.suffix in (".bin", ".xml"):
if path.suffix == ".bin":
bin_path, xml_path = path, path.with_suffix(".xml")
elif path.suffix == ".xml":
xml_path, bin_path = path, path.with_suffix(".bin")
model = core.read_model(xml_path, bin_path)
elif path.suffix == ".onnx":
model = core.read_model(path)
else:
msg = f"Path must be .onnx, .bin or .xml file. Got {path.suffix}"
raise ValueError(msg)
# Create cache folder
cache_folder = Path("cache")
cache_folder.mkdir(exist_ok=True)
core.set_property({"CACHE_DIR": cache_folder})
compile_model = core.compile_model(model=model, device_name=self.device, config=self.config)
input_blob = compile_model.input(0)
output_blob = compile_model.output(0)
return input_blob, output_blob, compile_model
def pre_process(self, image: np.ndarray) -> np.ndarray:
"""Pre-process the input image by applying transformations.
Args:
image (np.ndarray): Input image.
Returns:
np.ndarray: pre-processed image.
"""
processed_image = image
if len(processed_image.shape) == 3:
processed_image = np.expand_dims(processed_image, axis=0)
if processed_image.shape[-1] == 3:
processed_image = processed_image.transpose(0, 3, 1, 2)
return processed_image
def predict(
self,
image: str | Path | np.ndarray,
metadata: dict[str, Any] | None = None,
) -> ImageResult:
"""Perform a prediction for a given input image.
The main workflow is (i) pre-processing, (ii) forward-pass, (iii) post-process.
Args:
image (Union[str, np.ndarray]): Input image whose output is to be predicted.
It could be either a path to image or numpy array itself.
metadata: Metadata information such as shape, threshold.
Returns:
ImageResult: Prediction results to be visualized.
"""
# Convert file path or string to image if necessary
if isinstance(image, str | Path):
image = Image.open(image)
# Convert PIL image to numpy array
if isinstance(image, Image.Image):
image = np.array(image, dtype=np.float32)
if not isinstance(image, np.ndarray):
msg = f"Input image must be a numpy array or a path to an image. Got {type(image)}"
raise TypeError(msg)
# Resize image to model input size if not dynamic
if self.input_blob.partial_shape[2].is_static and self.input_blob.partial_shape[3].is_static:
image = cv2.resize(image, tuple(list(self.input_blob.shape)[2:][::-1]))
# Normalize numpy array to range [0, 1]
if image.dtype != np.float32:
image = image.astype(np.float32)
if image.max() > 1.0:
image /= 255.0
# Check if metadata is provided, if not use the default metadata.
if metadata is None:
metadata = self.metadata if hasattr(self, "metadata") else {}
metadata["image_shape"] = image.shape[:2]
processed_image = self.pre_process(image)
predictions = self.forward(processed_image)
output = self.post_process(predictions, metadata=metadata)
return ImageResult(
image=(image * 255).astype(np.uint8),
pred_score=output["pred_score"],
pred_label=output["pred_label"],
anomaly_map=output["anomaly_map"],
pred_mask=output["pred_mask"],
pred_boxes=output["pred_boxes"],
box_labels=output["box_labels"],
)
def forward(self, image: np.ndarray) -> np.ndarray:
"""Forward-Pass input tensor to the model.
Args:
image (np.ndarray): Input tensor.
Returns:
np.ndarray: Output predictions.
"""
return self.model(image)
def post_process(self, predictions: np.ndarray, metadata: dict | DictConfig | None = None) -> dict[str, Any]:
"""Post process the output predictions.
Args:
predictions (np.ndarray): Raw output predicted by the model.
metadata (Dict, optional): Metadata. Post-processing step sometimes requires
additional metadata such as image shape. This variable comprises such info.
Defaults to None.
Returns:
dict[str, Any]: Post processed prediction results.
"""
if metadata is None:
metadata = self.metadata
predictions = predictions[self.output_blob]
# Initialize the result variables.
anomaly_map: np.ndarray | None = None
pred_label: LabelName | None = None
pred_mask: float | None = None
# If predictions returns a single value, this means that the task is
# classification, and the value is the classification prediction score.
if len(predictions.shape) == 1:
task = TaskType.CLASSIFICATION
pred_score = predictions
else:
task = TaskType.SEGMENTATION
anomaly_map = predictions.squeeze()
pred_score = anomaly_map.reshape(-1).max()
# Common practice in anomaly detection is to assign anomalous
# label to the prediction if the prediction score is greater
# than the image threshold.
if "image_threshold" in metadata:
pred_idx = pred_score >= metadata["image_threshold"]
pred_label = LabelName.ABNORMAL if pred_idx else LabelName.NORMAL
if task == TaskType.CLASSIFICATION:
_, pred_score = self._normalize(pred_scores=pred_score, metadata=metadata)
elif task in (TaskType.SEGMENTATION, TaskType.DETECTION):
if "pixel_threshold" in metadata:
pred_mask = (anomaly_map >= metadata["pixel_threshold"]).astype(np.uint8)
anomaly_map, pred_score = self._normalize(
pred_scores=pred_score,
anomaly_maps=anomaly_map,
metadata=metadata,
)
if anomaly_map is None:
msg = "Anomaly map cannot be None."
raise ValueError(msg)
if "image_shape" in metadata and anomaly_map.shape != metadata["image_shape"]:
image_height = metadata["image_shape"][0]
image_width = metadata["image_shape"][1]
anomaly_map = cv2.resize(anomaly_map, (image_width, image_height))
if pred_mask is not None:
pred_mask = cv2.resize(pred_mask, (image_width, image_height))
else:
msg = f"Unknown task type: {task}"
raise ValueError(msg)
if self.task == TaskType.DETECTION:
pred_boxes = self._get_boxes(pred_mask)
box_labels = np.ones(pred_boxes.shape[0])
else:
pred_boxes = None
box_labels = None
return {
"anomaly_map": anomaly_map,
"pred_label": pred_label,
"pred_score": pred_score,
"pred_mask": pred_mask,
"pred_boxes": pred_boxes,
"box_labels": box_labels,
}
@staticmethod
def _get_boxes(mask: np.ndarray) -> np.ndarray:
"""Get bounding boxes from masks.
Args:
mask (np.ndarray): Input mask of shape (H, W)
Returns:
np.ndarray: array of shape (N, 4) containing the bounding box coordinates of the objects in the masks
in xyxy format.
"""
_, comps = cv2.connectedComponents(mask)
labels = np.unique(comps)
boxes = []
for label in labels[labels != 0]:
y_loc, x_loc = np.where(comps == label)
boxes.append([np.min(x_loc), np.min(y_loc), np.max(x_loc), np.max(y_loc)])
return np.stack(boxes) if boxes else np.empty((0, 4))