### algorithms tutorial linear_machine_x2_projection 3

This algorithm is a legacy one. The API has changed since its implementation. New versions and forks will need to be updated.
This algorithm is splittable

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
image system/array_2d_uint8/1 Input
id system/uint64/1 Input
projections system/array_2d_floats/1 Output

#### Unnamed group

Endpoint Name Data Format Nature
subspace_lda tutorial/linear_machine/1 Input
subspace_pca tutorial/linear_machine/1 Input

The code for this algorithm in Python
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This algorithm linearizes and accumulates images into a buffer, before applying two consecutive linear transformations (using projection matrices computed by principal component analysis (PCA) and by linear discriminant analysis (LDA)). The linear transformations rely on the Bob library.

The inputs are:

• image: an image as a two-dimensional arrays of floats (64 bits)
• id: an identifier which is used as follows: all images with the
same identifier are accumulated into the same buffer
• subspace_pca: a PCA-learnt linear transformation as a collection of
weights, biases, input subtraction and input division factors.
• subspace_lda: a LDA-learnt linear transformation as a collection of
weights, biases, input subtraction and input division factors.

The output projections is a two-dimensional array of floats (64 bits), the number of rows corresponding to the number of accumulated images (with the same identifier), and the number of columns to the output dimensionality after applying the linear transformations.

No experiments are using this algorithm.

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.