TensorflowPredict2D¶

standard mode | Machine Learning category

Inputs¶

signal (matrix_real) - the input features

Outputs¶

predictions (vector_vector_real) - the output predictions from the node named after output

Parameters¶

accumulate (bool ∈ {true, false}, default = false) :
(deprecated, use batchSize) when true it runs a single TensorFlow session at the end of the stream. Otherwise, a session is run for every new patch

batchSize (integer ∈ [-1, ∞), default = 64) :
batch size for prediction. This allows parallelization when GPUs are available. Set it to -1 or 0 to accumulate all the patches and run a single TensorFlow session at the end of the stream

dimensions (integer ∈ [0, ∞), default = 200) :
number of dimensions on the input features. This parameter is overridden by the shape of the input data

graphFilename (string, default = “”) :
name of the file from which to load the TensorFlow graph

input (string, default = model/Placeholder) :
name of the input node in the TensorFlow graph

isTrainingName (string, default = “”) :
name of an additional input node to indicate the model if it is in training mode or not. Leave it empty when the model does not need such input

lastPatchMode (string ∈ {discard, repeat}, default = discard) :
what to do with the last timestamps: repeat them to fill the last patch or discard them

output (string, default = model/Sigmoid) :
name of the node from which to retrieve the output tensors

patchHopSize (integer ∈ [0, ∞), default = 1) :
number of timestamps between the beginning of adjacent patches. 0 to avoid overlap

patchSize (integer ∈ [0, ∞), default = 1) :
number of timestamps required for each inference. This parameter should match the model’s expected input shape.

savedModel (string, default = “”) :
name of the TensorFlow SavedModel. Overrides the parameter graphFilename

Description¶

This algorithm makes predictions using models expecting 2D representations.

It expects an input feature matrix with shape (timestamps, dimensions) and processes it sequentially along the time axis. Internally, the algorithm generates tensors with shape (batchSize, 1, patchSize, dimensions) so that the input can be processed by TensorflowPredict. patchSize is the number of timestamps that the model expects, batchSize is the number of patches to be fed to the model at once (most useful when a GPU is available), and patchHopSize is the number of timestamps that separate the beginning of adjacent patches.

By setting the batchSize parameter to -1 or 0 the patches are stored to run a single TensorFlow session at the end of the stream. This allows taking advantage of parallelization when GPUs are available, but at the same time, it can be memory exhausting for long files.

A possible pipeline is as follows:

MonoLoader(sampleRate=16000) >> TensorflowPredictMusiCNN(graphFilename='embedding_model.pb') >> TensorflowPredict2D(graphFilename='classification_model.pb')

Note: This algorithm does not make any check on the input model so it is the user’s responsibility to make sure it is a valid one.

Note 2: In standard mode, the dimensions parameter is overridden with the shape of the input data. However, in streaming mode, the user is responsible for setting dimensions to the adequate value. Otherwise, an exception is thrown.

References:

Supported models at https://essentia.upf.edu/models/

Source code¶

C++ source code

C++ header file