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Computes a histogram over x, given the bin boundaries or bin count.
tft.histogram(
x, boundaries=None, categorical=False, name=None
)
Ex (1): counts, boundaries = histogram([0, 1, 0, 1, 0, 3, 0, 1], range(5)) counts: [4, 3, 0, 1, 0] boundaries: [0, 1, 2, 3, 4]
Ex (2): Can be used to compute class weights. counts, classes = histogram([0, 1, 0, 1, 0, 3, 0, 1], categorical=True) probabilities = counts / tf.reduce_sum(counts) class_weights = dict(map(lambda (a, b): (a.numpy(), 1.0 / b.numpy()), zip(classes, probabilities)))
Args | |
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x
|
A Tensor or SparseTensor.
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boundaries
|
(Optional) A Tensor or int used to build the histogram;
ignored if categorical is True. If possible, provide boundaries as
multiple sorted values. Default to 10 intervals over the 0-1 range,
or find the min/max if an int is provided (not recommended because
multi-phase analysis is inefficient).
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categorical
|
(Optional) A bool that treats x as discrete values if true.
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name
|
(Optional) A name for this operation. |
Returns | |
|---|---|
counts
|
The histogram, as counts per bin. |
boundaries
|
A Tensor used to build the histogram representing boundaries.
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