BEAT - amohammadi/linear_machine_projection_and

This algorithm is a sequential one. The platform will call its process() method once per data incoming on its inputs.

Endpoint Groups 2

Algorithms have at least one input and one output. All algorithm endpoints are organized in groups. Groups are used by the platform to indicate which inputs and outputs are synchronized together. The first group is automatically synchronized with the channel defined by the block in which the algorithm is deployed.

Group: main

Endpoint Name	Data Format	Nature
probe_image	system/array_2d_uint8/1	Input
template_images	system/array_3d_uint8/1	Input
score	system/float/1	Output

Group: model

Endpoint Name	Data Format	Nature
linear_model	tutorial/linear_machine/1	Input

import numpy as np
import scipy.spatial

def project(image, weights, biases, input_subtract, input_divide):
    image = (image.flatten() - input_subtract) / input_divide
    image = np.dot(image, weights.T) + biases
    return image

class Algorithm:
    def __init__(self):
        self.projections = []

def prepare(self, data_loaders):
        # Loads the model at the beginning
        loader = data_loaders.loaderOf("linear_model")
        for i in range(loader.count()):
            view = loader.view("linear_model", i)
            data, _, _ = view[0]
            data = data["linear_model"]
            self.weights = data.weights
            self.biases = data.biases
            self.input_subtract = data.input_subtract
            self.input_divide = data.input_divide
        return True

def process(self, inputs, data_loaders, outputs):

# collect all the image projections for the current template
        probe_image = inputs["probe_image"].data.value.astype("float64")
        probe_image = project(
            probe_image,
            self.weights,
            self.biases,
            self.input_subtract,
            self.input_divide,
        )

template_images = inputs["template_images"].data.value.astype("float64")
        template_images = [
            project(
                img,
                self.weights,
                self.biases,
                self.input_subtract,
                self.input_divide,
            )
            for img in template_images
        ]

score = -np.min(
            [
                scipy.spatial.distance.euclidean(template_img, probe_image)
                for template_img in template_images
            ]
        )

outputs["score"].write({"value": score})

return True

The code for this algorithm in Python
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A biometrics algorithm that compares a probe image to a set of template images and outputs a comparison score. This algorithm was trained on the ATNT database and reproduces the EigenFaces face recognition baseline. The input images must be gray-scale and of the size of 92x92.

Experiments

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Status:

			Updated	Name	Databases/Protocols	Analyzers
				amohammadi/amohammadi/atnt_eigenfaces/1/atnt1	atnt/6@idiap	amohammadi/eer_analyzer/1

Python (2.1.0) 1

This table shows the number of times this algorithm has been successfully run using the given environment. Note this does not provide sufficient information to evaluate if the algorithm will run when submitted to different conditions.

algorithms amohammadi linear_machine_projection_and_comparison 1

Endpoint Groups 2

Group: main

Group: model

Experiments

algorithms

amohammadi

linear_machine_projection_and_comparison

1