mAP for segmentation apps

segmentation_mAP.py

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+'''
+URL : https://github.com/cosmiq/solaris
+Code based on: https://github.com/CosmiQ/solaris/blob/main/solaris/eval/vector.py with some modifications
+'''
+
+import os
+import glob
+from tqdm import tqdm
+import numpy as np
+import geopandas as gpd
+
+
+def average_score_by_class(ious, threshold=0.5):
+    """ for a list of object ious by class, test if they are a counted as a
+    positive or a negative.
+    Arguments
+    ---------
+        ious : list of lists
+            A list containing individual lists of ious for eachobject class.
+        threshold : float , optional
+            A value between 0.0 and 1.0 that determines the threshold for a true positve.
+            The 0.5 is its default value , which it can be changed optionally.
+    Returns
+    ---------
+        average_by_class : list
+            A list containing the ratio of true positives for each class
+    """
+    binary_scoring_lists = []
+    for x in ious:
+        items = []
+        for i in x:
+            if i >= threshold:
+                items.append(1)
+            else:
+                items.append(0)
+        binary_scoring_lists.append(items)
+    average_by_class = []
+    for l in binary_scoring_lists:
+        average_by_class.append(np.nanmean(l))
+    return average_by_class
+
+
+
+
+def calculate_iou(pred_poly, test_data_GDF):
+    """Get the best intersection over union for a predicted polygon.
+
+    Arguments
+    ---------
+    pred_poly : :py:class:`shapely.Polygon`
+        Prediction polygon to test.
+    test_data_GDF : :py:class:`geopandas.GeoDataFrame`
+        GeoDataFrame of ground truth polygons to test ``pred_poly`` against.
+
+    Returns
+    -------
+    iou_GDF : :py:class:`geopandas.GeoDataFrame`
+        A subset of ``test_data_GDF`` that overlaps ``pred_poly`` with an added
+        column ``iou_score`` which indicates the intersection over union value.
+
+    """
+
+    # Fix bowties and self-intersections
+    if not pred_poly.is_valid:
+        pred_poly = pred_poly.buffer(0.0)
+
+    precise_matches = test_data_GDF[test_data_GDF.intersects(pred_poly)]
+
+    iou_row_list = []
+    for _, row in precise_matches.iterrows():
+        # Load ground truth polygon and check exact iou
+        test_poly = row.geometry
+        # Ignore invalid polygons for now
+        if pred_poly.is_valid and test_poly.is_valid:
+            intersection = pred_poly.intersection(test_poly).area
+            union = pred_poly.union(test_poly).area
+            # Calculate iou
+            iou_score = intersection / float(union)
+        else:
+            iou_score = 0
+        row['iou_score'] = iou_score
+        iou_row_list.append(row)
+
+    iou_GDF = gpd.GeoDataFrame(iou_row_list)
+    return iou_GDF
+
+def get_all_objects(proposal_polygons_dir, gt_polygons_dir,
+                    prediction_cat_attrib="class", gt_cat_attrib='make',
+                    file_format="geojson"):
+    """ Using the proposal and ground truth polygons, calculate the total.
+    Filenames of predictions and ground-truth must be identical.
+    unique classes present in each
+    Arguments
+    ---------
+        proposal_polygons_dir : str
+            The path that contains any model proposal polygons
+        gt_polygons_dir : str
+            The path that contains the ground truth polygons
+        prediction_cat_attrib : str
+            The column or attribute within the predictions that specifies
+            unique classes
+            replace "class" with the column/attribute name
+        gt_cat_attrib : str 
+            The column or attribute within the ground truth that
+            specifies unique classes
+            replace 'make' with the column/attribute name
+        file_format : str , optional
+            The extension or file format for predictions
+    Returns
+    ---------
+            prop_objs : list
+                All unique objects that exist in the proposals
+            gt_obj : list
+                All unique objects that exist in the ground truth
+            all_objs : list
+                A union of the prop_objs and gt_objs lists
+    """
+    objs = []
+    os.chdir(proposal_polygons_dir)
+    search = "*" + file_format
+    proposal_geojsons = glob.glob(search)
+    for geojson in tqdm(proposal_geojsons):
+        ground_truth_poly = os.path.join(gt_polygons_dir, geojson)
+        if os.path.exists(ground_truth_poly):
+            ground_truth_gdf = gpd.read_file(ground_truth_poly)
+            proposal_gdf = gpd.read_file(geojson)
+            for index, row in (proposal_gdf.iterrows()):
+                objs.append(row[prediction_cat_attrib])
+    prop_objs = list(set(objs))
+    os.chdir(gt_polygons_dir)
+    search = "*" + file_format
+    objs = []
+    gt_geojsons = glob.glob(search)
+    for geojson in tqdm(gt_geojsons):
+        proposal_poly = os.path.join(proposal_polygons_dir, geojson)
+        if os.path.exists(proposal_poly):
+            proposal_gdf = gpd.read_file(proposal_poly)
+            ground_truth_gdf = gpd.read_file(geojson)
+            for index, row in (ground_truth_gdf.iterrows()):
+                objs.append(row[gt_cat_attrib])
+    gt_objs = list(set(objs))
+    all_objs = gt_objs + prop_objs
+    all_objs = list(set(all_objs))
+    return prop_objs, gt_objs, all_objs
+
+def calculate_matching_iou(iou_GDF, proposal_row, ground_truth_gdf, prediction_cat_attrib, gt_cat_attrib):
+    """
+    Calculate the matching IoU for a single proposal against ground truth.
+
+    Arguments:
+    -----------
+    iou_GDF : GeoDataFrame
+        GeoDataFrame containing IoU scores.
+    proposal_row : GeoSeries
+        The row from the proposal GeoDataFrame.
+    ground_truth_gdf : GeoDataFrame
+        The GeoDataFrame containing ground truth polygons.
+    prediction_cat_attrib : str
+        The attribute in the proposal for class/category.
+    gt_cat_attrib : str
+        The attribute in the ground truth for class/category.
+
+    Returns:
+    --------
+    float
+        The IoU score if a matching ground truth is found, 0 otherwise.
+    """
+    if 'iou_score' in iou_GDF.columns:
+        # Find the maximum IoU score and corresponding ground truth
+        iou = iou_GDF.iou_score.max()
+        max_iou_row = iou_GDF.loc[iou_GDF['iou_score'].idxmax()]
+        id_1 = proposal_row[prediction_cat_attrib]
+        id_2 = ground_truth_gdf.loc[max_iou_row.name][gt_cat_attrib]
+
+        # Check if the class/category matches
+        if id_1 == id_2:
+            ground_truth_gdf.drop(max_iou_row.name, axis=0, inplace=True)
+            return iou
+    return 0
+
+def process_object_category(proposal_gdf, object_category, gt_cat_attrib, confidence_attrib=None):
+    """
+    Process each object category for IoU and confidence score accumulation.
+
+    Arguments:
+    -----------
+    proposal_gdf : GeoDataFrame
+        The GeoDataFrame containing proposal polygons.
+    object_category : str
+        The current object category to process.
+    gt_cat_attrib : str
+        The attribute in the ground truth for class/category.
+    confidence_attrib : str, optional
+        The attribute in the proposal for confidence scores.
+
+    Returns:
+    --------
+    ious : list
+        List of IoU scores for the object category (all zeros in this case).
+    confidences : list
+        List of confidence scores for the object category.
+    """
+    ious = []
+    confidences = []
+    proposal_gdf_filtered = proposal_gdf[proposal_gdf[gt_cat_attrib] == object_category]
+
+    for _ in range(len(proposal_gdf_filtered)):
+        ious.append(0)  # Append 0 for IoU as there's no matching ground truth
+
+    if confidence_attrib:
+        confidences = [row[confidence_attrib] for _, row in proposal_gdf_filtered.iterrows()]
+
+    return ious, confidences
+
+
+
+
+def precision_calc(proposal_polygons_dir, gt_polygons_dir,
+                   prediction_cat_attrib="class", gt_cat_attrib='make', confidence_attrib=None,
+                   object_subset=[], threshold=0.5, file_format="geojson"):
+    """ Using the proposal and ground truth polygons, calculate precision metrics.
+    Filenames of predictions and ground-truth must be identical.  Will only
+    calculate metric for classes that exist in the ground truth.
+    Arguments
+    ---------
+        proposal_polygons_dir : str
+            The path that contains any model proposal polygons
+        gt_polygons_dir : str
+            The path that contains the ground truth polygons
+        prediction_cat_attrib : str
+            The column or attribute within the predictions that specifies
+            unique classes
+            replace "class" with the name of the column/attribute
+        gt_cat_attrib : str
+            The column or attribute within the ground truth that
+            specifies unique classes
+            replace "make" with the name of the column/attribute
+        confidence_attrib : str
+            The column or attribute within the proposal polygons that
+            specifies model confidence for each prediction
+            if it exists, replace "None" with the name of this column
+        object_subset : list
+            A list or subset of the unique objects that are contained within the
+            ground truth polygons. If empty, this will be
+            auto-created using all classes that appear ground truth polygons.
+        threshold : float
+            A value between 0.0 and 1.0 that determines the IOU threshold for a
+            true positve.
+            It's set by default to 0.5.Can be changed optionally.
+        file_format : str
+            The extension or file format for predictions
+            by default set to geojson format
+    Returns
+    ---------
+        iou_holder : list of lists
+            An iou score for each object per class (precision specific)
+        precision_by_class : list
+            A list containing the precision score for each class
+        mPrecision : float
+            The mean precision score of precision_by_class
+        confidences : list of lists
+            All confidences for each object for each class
+    """
+    ious = []
+    dir = os.chdir(proposal_polygons_dir)
+    search = "*" + file_format
+    proposal_geojsons = glob.glob(search)
+    iou_holder = []
+    confidences = []
+    if len(object_subset) == 0:
+        prop_objs, object_subset, all_objs = get_all_objects(
+            proposal_polygons_dir, gt_polygons_dir,
+            prediction_cat_attrib=prediction_cat_attrib,
+            gt_cat_attrib=gt_cat_attrib, file_format=file_format)
+    for i in range(len(object_subset)):
+        iou_holder.append([])
+        confidences.append([])
+
+    for geojson in tqdm(proposal_geojsons):
+        ground_truth_poly = os.path.join(gt_polygons_dir, geojson)
+        if os.path.exists(ground_truth_poly):
+            ground_truth_gdf = gpd.read_file(ground_truth_poly)
+            proposal_gdf = gpd.read_file(geojson)
+            i = 0
+            for obj in object_subset:
+                conf_holder = []
+                proposal_gdf2 = proposal_gdf[proposal_gdf[prediction_cat_attrib] == obj]
+                for index, row in (proposal_gdf2.iterrows()):
+                    if confidence_attrib is not None:
+                        conf_holder.append(row[confidence_attrib])
+                    iou_GDF = calculate_iou(row.geometry, ground_truth_gdf)
+                    iou = calculate_matching_iou(iou_GDF, row, ground_truth_gdf, prediction_cat_attrib, gt_cat_attrib)
+                    ious.append(iou)
+                for item in ious:
+                    iou_holder[i].append(item)
+                if confidence_attrib is not None:
+                    for conf in conf_holder:
+                        confidences[i].append(conf)
+                ious = []
+                i += 1
+        else:
+            print("Warning- No ground truth for:", geojson)
+            proposal_gdf = gpd.read_file(geojson)
+            i = 0
+
+            for j, obj in enumerate(object_subset):
+                ious, conf_holder = process_object_category(proposal_gdf, obj, gt_cat_attrib, confidence_attrib)
+                iou_holder[j].extend(ious)
+                confidences[j].extend(conf_holder)
+                i += 1
+                ious = []
+    precision_by_class = average_score_by_class(iou_holder, threshold=threshold)
+    precision_by_class = list(np.nan_to_num(precision_by_class))
+    mPrecision = np.nanmean(precision_by_class)
+    print("mPrecision:", mPrecision)
+
+    return iou_holder, precision_by_class, mPrecision, confidences
+