Abstract: An electronic device with a display and a touch-sensitive surface displays a first authentication user interface on the display, the first authentication user interface including a text entry field for entering a text-based authentication code; detects a first input by a user on the touch-sensitive surface while displaying the first authentication user interface; in response to detecting the first input, displays a second authentication user interface on the display, distinct from the first authentication user interface, the second authentication user interface configured for entering a gesture-based authentication code; while displaying the second authentication user interface, detects one or more gestures by the user at locations on the touch-sensitive surface that correspond to locations on the second authentication user interface; and authenticates the user in accordance with a determination that the detected one or more gestures correspond to a gesture-based authentication code for the user.

Abstract: An electronic device with a display and a touch-sensitive surface displays a first authentication user interface on the display, the first authentication user interface including a text entry field for entering a text-based authentication code; detects a first input by a user on the touch-sensitive surface while displaying the first authentication user interface; in response to detecting the first input, displays a second authentication user interface on the display, distinct from the first authentication user interface, the second authentication user interface configured for entering a gesture-based authentication code; while displaying the second authentication user interface, detects one or more gestures by the user at locations on the touch-sensitive surface that correspond to locations on the second authentication user interface; and authenticates the user in accordance with a determination that the detected one or more gestures correspond to a gesture-based authentication code for the user.

Abstract: The disclosure is directed to evaluating feature vectors using decision trees. Typically, the number of feature vectors and the number of decision trees are very high, which prevents loading them into a processor cache. The feature vectors are evaluated by processing the feature vectors across a disjoint subset of trees repeatedly. After loading the feature vectors into the cache, they are evaluated across a first subset of trees, then across a second subset of trees and so on. If the values based on the first and second subsets satisfy a specified criterion, further evaluation of the feature vectors across the remaining of the decision trees is terminated, thereby minimizing the number of trees evaluated and therefore, consumption of computing resources.

Abstract: The disclosure is directed to evaluating feature vectors using decision trees. Typically, the number of feature vectors and the number of decision trees are very high, which prevents loading them into a processor cache. The feature vectors are evaluated by processing the feature vectors across a disjoint subset of trees repeatedly. After loading the feature vectors into the cache, they are evaluated across a first subset of trees, then across a second subset of trees and so on. If the values based on the first and second subsets satisfy a specified criterion, further evaluation of the feature vectors across the remaining of the decision trees is terminated, thereby minimizing the number of trees evaluated and therefore, consumption of computing resources.

Abstract: An electronic device with a display and a touch-sensitive surface displays a first authentication user interface on the display, the first authentication user interface including a text entry field for entering a text-based authentication code; detects a first input by a user on the touch-sensitive surface while displaying the first authentication user interface; in response to detecting the first input, displays a second authentication user interface on the display, distinct from the first authentication user interface, the second authentication user interface configured for entering a gesture-based authentication code; while displaying the second authentication user interface, detects one or more gestures by the user at locations on the touch-sensitive surface that correspond to locations on the second authentication user interface; and authenticates the user in accordance with a determination that the detected one or more gestures correspond to a gesture-based authentication code for the user.