yolov5sparse.py

# OBSS SAHI Tool
# Code written by Fatih C Akyon, 2020.
# Using YOLOv5 sparse models from Neural Magic using DeepSparse
# https://neuralmagic.com/deepsparse

import logging
from typing import Any, Dict, List, Optional

import numpy as np

from sahi.models.base import DetectionModel
from sahi.prediction import ObjectPrediction
from sahi.utils.compatibility import fix_full_shape_list, fix_shift_amount_list
from sahi.utils.import_utils import check_package_minimum_version, check_requirements

logger = logging.getLogger(__name__)


class Yolov5SparseDetectionModel(DetectionModel):
    def check_dependencies(self) -> None:
        check_requirements(["deepsparse", "sparseml"])

    def load_model(self):
        """
        Detection model is initialized and set to self.model.
        """

        from deepsparse import Pipeline

        try:
            model = Pipeline.create(task="yolo", model_path=self.model_path, image_size=self.image_size)
            self.set_model(model)
        except Exception as e:
            raise TypeError("Could not load the model: ", e)

    def set_model(self, model: Any):
        """
        Sets the underlying YOLOv5 model.
        Args:
            model: Any
                A YOLOv5 model
        """

        self.model = model

        # set category_mapping
        if not self.category_mapping:
            category_mapping = {str(ind): category_name for ind, category_name in enumerate(self.category_names)}
            self.category_mapping = category_mapping

    def perform_inference(self, image: np.ndarray):
        """
        Prediction is performed using self.model and the prediction result is set to self._original_predictions.
        Args:
            image: np.ndarray
                A numpy array that contains the image to be predicted. 3 channel image should be in RGB order.
        """

        # Confirm model is loaded
        if self.model is None:
            raise ValueError("Model is not loaded, load it by calling .load_model()")
        if self.image_size is not None:
            prediction_result = self.model(
                images=[image], conf_thres=self.confidence_threshold, image_size=self.image_size
            )
        else:
            prediction_result = self.model(images=[image], conf_thres=self.confidence_threshold)

        self._original_predictions = prediction_result

    @property
    def num_categories(self):
        """
        Returns number of categories
        """
        return 80

    @property
    def category_names(self):
        return [
            "person",
            "bicycle",
            "car",
            "motorcycle",
            "airplane",
            "bus",
            "train",
            "truck",
            "boat",
            "traffic light",
            "fire hydrant",
            "stop sign",
            "parking meter",
            "bench",
            "bird",
            "cat",
            "dog",
            "horse",
            "sheep",
            "cow",
            "elephant",
            "bear",
            "zebra",
            "giraffe" "backpack",
            "umbrella",
            "handbag",
            "tie",
            "suitcase",
            "frisbee",
            "skis",
            "snowboard",
            "sports ball",
            "kite",
            "baseball bat",
            "baseball glove",
            "skateboard",
            "surfboard",
            "tennis racket",
            "bottle",
            "wine glass",
            "cup",
            "fork",
            "knife",
            "spoon",
            "bowl",
            "banana",
            "apple",
            "sandwich",
            "orange",
            "broccoli",
            "carrot",
            "hot dog",
            "pizza",
            "donut",
            "cake",
            "chair",
            "couch",
            "potted plant",
            "bed",
            "dining table",
            "toilet",
            "tv",
            "laptop",
            "mouse",
            "remote",
            "keyboard",
            "cell phone",
            "microwave",
            "oven",
            "toaster",
            "sink",
            "refrigerator",
            "book",
            "clock",
            "vase",
            "scissors",
            "teddy bear",
            "hair drier",
            "toothbrush",
        ]

    def _create_object_prediction_list_from_original_predictions(
        self,
        shift_amount_list: Optional[List[List[int]]] = [[0, 0]],
        full_shape_list: Optional[List[List[int]]] = None,
    ):
        """
        self._original_predictions is converted to a list of prediction.ObjectPrediction and set to
        self._object_prediction_list_per_image.
        Args:
            shift_amount_list: list of list
                To shift the box and mask predictions from sliced image to full sized image, should
                be in the form of List[[shift_x, shift_y],[shift_x, shift_y],...]
            full_shape_list: list of list
                Size of the full image after shifting, should be in the form of
                List[[height, width],[height, width],...]
        """

        original_predictions = self._original_predictions
        # compatilibty for sahi v0.8.15
        shift_amount_list = fix_shift_amount_list(shift_amount_list)
        full_shape_list = fix_full_shape_list(full_shape_list)

        # handle all predictions
        object_prediction_list_per_image = []
        for image_ind, (prediction_bboxes, prediction_scores, prediction_categories) in enumerate(original_predictions):
            shift_amount = shift_amount_list[image_ind]
            full_shape = None if full_shape_list is None else full_shape_list[image_ind]
            object_prediction_list = []

            # process predictions
            for bbox, score, category_id in zip(prediction_bboxes, prediction_scores, prediction_categories):
                category_id = int(float(category_id))
                category_name = self.category_mapping[str(category_id)]

                # fix out of image box coords
                if full_shape is not None:
                    bbox[0] = min(full_shape[1], bbox[0])
                    bbox[1] = min(full_shape[0], bbox[1])
                    bbox[2] = min(full_shape[1], bbox[2])
                    bbox[3] = min(full_shape[0], bbox[3])

                # ignore invalid predictions
                if not (bbox[0] < bbox[2]) or not (bbox[1] < bbox[3]):
                    logger.warning(f"ignoring invalid prediction with bbox: {bbox}")
                    continue

                object_prediction = ObjectPrediction(
                    bbox=bbox,
                    category_id=category_id,
                    score=score,
                    segmentation=None,
                    category_name=category_name,
                    shift_amount=shift_amount,
                    full_shape=full_shape,
                )
                object_prediction_list.append(object_prediction)
            object_prediction_list_per_image.append(object_prediction_list)

        self._object_prediction_list_per_image = object_prediction_list_per_image