FM / distributions

/usr/local/lib64/python3.6/site-packages/torch/distributions/

/usr/local/lib64/python3.6/site-packages/torch/distributions

Name	Size	Mode	Actions
__pycache__/	-	0755	rm
bernoulli.py	3904	0644	edit dl rm
beta.py	3406	0644	edit dl rm
binomial.py	5179	0644	edit dl rm
categorical.py	5488	0644	edit dl rm
cauchy.py	2714	0644	edit dl rm
chi2.py	909	0644	edit dl rm
constraints.py	17288	0644	edit dl rm
constraint_registry.py	10234	0644	edit dl rm
continuous_bernoulli.py	8532	0644	edit dl rm
dirichlet.py	3584	0644	edit dl rm
distribution.py	11735	0644	edit dl rm
exponential.py	2525	0644	edit dl rm
exp_family.py	2275	0644	edit dl rm
fishersnedecor.py	3152	0644	edit dl rm
gamma.py	3121	0644	edit dl rm
geometric.py	4266	0644	edit dl rm
gumbel.py	2528	0644	edit dl rm
half_cauchy.py	2257	0644	edit dl rm
half_normal.py	2058	0644	edit dl rm
independent.py	4361	0644	edit dl rm
kl.py	29998	0644	edit dl rm
kumaraswamy.py	2927	0644	edit dl rm
laplace.py	3054	0644	edit dl rm
lkj_cholesky.py	6124	0644	edit dl rm
logistic_normal.py	1983	0644	edit dl rm
log_normal.py	1772	0644	edit dl rm
lowrank_multivariate_normal.py	9930	0644	edit dl rm
mixture_same_family.py	8636	0644	edit dl rm
multinomial.py	4776	0644	edit dl rm
multivariate_normal.py	10548	0644	edit dl rm
negative_binomial.py	4091	0644	edit dl rm
normal.py	3351	0644	edit dl rm
one_hot_categorical.py	4375	0644	edit dl rm
pareto.py	2057	0644	edit dl rm
poisson.py	2066	0644	edit dl rm
relaxed_bernoulli.py	5360	0644	edit dl rm
relaxed_categorical.py	5202	0644	edit dl rm
studentT.py	3550	0644	edit dl rm
transformed_distribution.py	8270	0644	edit dl rm
transforms.py	38408	0644	edit dl rm
uniform.py	3112	0644	edit dl rm
utils.py	6196	0644	edit dl rm
von_mises.py	5091	0644	edit dl rm
weibull.py	2854	0644	edit dl rm
__init__.py	5884	0644	edit dl rm

Edit: /usr/local/lib64/python3.6/site-packages/torch/distributions/geometric.py (4266B)

from numbers import Number

import torch
from torch.distributions import constraints
from torch.distributions.distribution import Distribution
from torch.distributions.utils import broadcast_all, probs_to_logits, logits_to_probs, lazy_property
from torch.nn.functional import binary_cross_entropy_with_logits

class Geometric(Distribution):
    r"""
    Creates a Geometric distribution parameterized by :attr:`probs`,
    where :attr:`probs` is the probability of success of Bernoulli trials.
    It represents the probability that in :math:`k + 1` Bernoulli trials, the
    first :math:`k` trials failed, before seeing a success.

Samples are non-negative integers [0, :math:`\inf`).

Example::

>>> m = Geometric(torch.tensor([0.3]))
        >>> m.sample()  # underlying Bernoulli has 30% chance 1; 70% chance 0
        tensor([ 2.])

Args:
        probs (Number, Tensor): the probability of sampling `1`. Must be in range (0, 1]
        logits (Number, Tensor): the log-odds of sampling `1`.
    """
    arg_constraints = {'probs': constraints.unit_interval,
                       'logits': constraints.real}
    support = constraints.nonnegative_integer

def __init__(self, probs=None, logits=None, validate_args=None):
        if (probs is None) == (logits is None):
            raise ValueError("Either `probs` or `logits` must be specified, but not both.")
        if probs is not None:
            self.probs, = broadcast_all(probs)
        else:
            self.logits, = broadcast_all(logits)
        probs_or_logits = probs if probs is not None else logits
        if isinstance(probs_or_logits, Number):
            batch_shape = torch.Size()
        else:
            batch_shape = probs_or_logits.size()
        super(Geometric, self).__init__(batch_shape, validate_args=validate_args)
        if self._validate_args and probs is not None:
            # Add an extra check beyond unit_interval
            value = self.probs
            valid = value > 0
            if not valid.all():
                invalid_value = value.data[~valid]
                raise ValueError(
                    "Expected parameter probs "
                    f"({type(value).__name__} of shape {tuple(value.shape)}) "
                    f"of distribution {repr(self)} "
                    f"to be positive but found invalid values:\n{invalid_value}"
                )

def expand(self, batch_shape, _instance=None):
        new = self._get_checked_instance(Geometric, _instance)
        batch_shape = torch.Size(batch_shape)
        if 'probs' in self.__dict__:
            new.probs = self.probs.expand(batch_shape)
        if 'logits' in self.__dict__:
            new.logits = self.logits.expand(batch_shape)
        super(Geometric, new).__init__(batch_shape, validate_args=False)
        new._validate_args = self._validate_args
        return new

@property
    def mean(self):
        return 1. / self.probs - 1.

@property
    def variance(self):
        return (1. / self.probs - 1.) / self.probs

@lazy_property
    def logits(self):
        return probs_to_logits(self.probs, is_binary=True)

@lazy_property
    def probs(self):
        return logits_to_probs(self.logits, is_binary=True)

def sample(self, sample_shape=torch.Size()):
        shape = self._extended_shape(sample_shape)
        tiny = torch.finfo(self.probs.dtype).tiny
        with torch.no_grad():
            if torch._C._get_tracing_state():
                # [JIT WORKAROUND] lack of support for .uniform_()
                u = torch.rand(shape, dtype=self.probs.dtype, device=self.probs.device)
                u = u.clamp(min=tiny)
            else:
                u = self.probs.new(shape).uniform_(tiny, 1)
            return (u.log() / (-self.probs).log1p()).floor()

def log_prob(self, value):
        if self._validate_args:
            self._validate_sample(value)
        value, probs = broadcast_all(value, self.probs)
        probs = probs.clone(memory_format=torch.contiguous_format)
        probs[(probs == 1) & (value == 0)] = 0
        return value * (-probs).log1p() + self.probs.log()

def entropy(self):
        return binary_cross_entropy_with_logits(self.logits, self.probs, reduction='none') / self.probs

cmd: