Inference¶
Contents
A PredictSession
provides access to making prediction
from saved models. Predictions for a single point are stored
in the Prediction
.
PredictSession¶
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class
smurff.
PredictSession
(h5_fname)¶ TrainSession for making predictions using a model generated using a
TrainSession
.A
PredictSession
can be made directly from aTrainSession
>>> predict_session = train_session.makePredictSession()
or from an HDF5 file
>>> predict_session = PredictSession("saved_output.hdf5")
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predict
(operands, samples=None)¶ Generate predictions on operands. Parameters specify coordinates of sideinfo/features for each dimension.
Parameters: - operands (tuple) –
A combination of coordindates in the matrix/tensor and/or features you want to use to make predictions. len(operands) should be equal to number of dimensions in the sample. Each element operands can be a:
- int : a single element in this dimension is selected. For example, a single row or column in a matrix.
slice
: a slice is selected in this dimension. For example, a number of rows or columns in a matrix.- Ellipsis or None: all elements in this dimension are selected. For example, all rows or columns in a matrix.
numpy.ndarray
: 2D numpy array used as dense sideinfo. Each row vector is used as side-info.scipy.sparse.spmatrix
: sparse matrix used as sideinfo. Each row vector is used as side-info.
- samples (range or None) – Range of samples to use for prediction, or None for all samples
Returns: list of N
numpy.ndarray`s of shape `[ T1 x T2 x ... ]
where N is the number of samples in this PredictSession and T1 x T2 x …Return type: lis of numpy.ndarray
- operands (tuple) –
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predict_all
()¶ Computes prediction matrix/tensor for full train data shape.
Returns: N numpy.ndarray`s of shape `[ T1 x T2 x ... ]
where N is the number of samples in this PredictSession and T1 x T2 x … is the shape of the train dataReturn type: list of numpy.ndarray
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predict_sparse
(test_matrix)¶ Computes prediction for all elements in a sparse test matrix
Parameters: test_matrix (scipy sparse matrix) – Returns: list of N scipy.sparse.sp_matrix
objects, where N is the number of samplesReturn type: list
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Prediction¶
-
class
smurff.
Prediction
(coords, val, pred_1sample=nan, pred_avg=nan, var=nan, nsamples=-1)¶ Stores predictions for a single point in the matrix/tensor
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coords
¶ Position of this prediction in the train matrix/tensor
Type: shape
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val
¶ True value or “nan” if no true value is known
Type: float
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nsamples
¶ Number of samples collected to make this prediction
Type: int
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pred_1sample
¶ Predicted value using only the last sample
Type: float
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pred_avg
¶ Predicted value using the average prediction across all samples
Type: float
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var
¶ Variance amongst predictions across all samples
Type: float
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pred_all
¶ List of predictions, one for each sample
Type: list
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static
fromTestMatrix
(test_matrix_or_tensor)¶ Creates a list of predictions from a scipy sparse matrix”
Parameters: test_matrix (scipy sparse matrix) – Returns: List of Prediction
. Only the coordinate and true value is filled.Return type: list
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