Merge branch 'dev_1.9.0' into development_issue_1334

Author: beat-buesser

art/attacks/evasion/laser_attack/__init__.py

@@ -0,0 +1,76 @@
+# MIT License
+#
+# Copyright (C) The Adversarial Robustness Toolbox (ART) Authors 2021
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
+# documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit
+# persons to whom the Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
+# Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+"""
+This module implements the greedy search algorithm of the `LaserBeam` attack.
+
+| Paper link: https://arxiv.org/abs/2103.06504
+"""
+from typing import Optional, Tuple
+
+import numpy as np
+
+from art.attacks.evasion.laser_attack.utils import AdversarialObject, AdvObjectGenerator, DebugInfo, ImageGenerator
+
+
+def greedy_search(
+    image: np.ndarray,
+    estimator,
+    iterations: int,
+    actual_class: int,
+    actual_class_confidence: float,
+    adv_object_generator: AdvObjectGenerator,
+    image_generator: ImageGenerator,
+    debug: Optional[DebugInfo] = None,
+) -> Tuple[Optional[AdversarialObject], Optional[int]]:
+    """
+    Greedy search algorithm used to generate parameters of an adversarial object that added to the :image will mislead
+    the neural network.
+    Based on the paper:
+    https://openaccess.thecvf.com/content/CVPR2021/papers/Duan_Adversarial_Laser_Beam_Effective_Physical-World_Attack_to_DNNs_in_a_CVPR_2021_paper.pdf
+
+    :param image: Image to attack.
+    :param estimator: Predictor of the image class.
+    :param iterations: Maximum number of iterations of the algorithm.
+    :param actual_class:
+    :param actual_class_confidence:
+    :param adv_object_generator: Object responsible for adversarial object generation.
+    :param image_generator: Object responsible for image generation.
+    :param debug: Optional debug handler.
+    """
+
+    params = adv_object_generator.random()
+    for _ in range(iterations):
+        predicted_class = actual_class
+        for sign in [-1, 1]:
+            params_prim = adv_object_generator.update_params(params, sign=sign)
+            adversarial_image = image_generator.update_image(image, params_prim)
+            prediction = estimator.predict(adversarial_image)
+            if debug is not None:
+                DebugInfo.report(debug, params_prim, np.squeeze(adversarial_image, 0))
+            predicted_class = prediction.argmax()
+            confidence_adv = prediction[0][actual_class]
+
+            if confidence_adv <= actual_class_confidence:
+                params = params_prim
+                actual_class_confidence = confidence_adv
+                break
+
+        if predicted_class != actual_class:
+            return params, predicted_class
+
+    return None, None