class_docstr: Categorical distribution.
  
  The Categorical distribution is parameterized by either probabilities or
  log-probabilities of a set of `K` classes. It is defined over the integers
  `{0, 1, ..., K}`.
  
  The Categorical distribution is closely related to the `OneHotCategorical` and
  `Multinomial` distributions.  The Categorical distribution can be intuited as
  generating samples according to `argmax{ OneHotCategorical(probs) }` itself
  being identical to `argmax{ Multinomial(probs, total_count=1) }`.
  
  #### Mathematical Details
  
  The probability mass function (pmf) is,
  
  ```none
  pmf(k; pi) = prod_j pi_j**[k == j]
  ```
  
  #### Pitfalls
  
  The number of classes, `K`, must not exceed:
  - the largest integer representable by `self.dtype`, i.e.,
    `2**(mantissa_bits+1)` (IEEE 754),
  - the maximum `Tensor` index, i.e., `2**31-1`.
  
  In other words,
  
  ```python
  K <= min(2**31-1, {
    tf.float16: 2**11,
    tf.float32: 2**24,
    tf.float64: 2**53 }[param.dtype])
  ```
  
  Note: This condition is validated only when `self.validate_args = True`.
  
  #### Examples
  
  Creates a 3-class distribution with the 2nd class being most likely.
  
  ```python
  dist = Categorical(probs=[0.1, 0.5, 0.4])
  n = 1e4
  empirical_prob = tf.cast(
      tf.histogram_fixed_width(
        dist.sample(int(n)),
        [0., 2],
        nbins=3),
      dtype=tf.float32) / n
  # ==> array([ 0.1005,  0.5037,  0.3958], dtype=float32)
  ```
  
  Creates a 3-class distribution with the 2nd class being most likely.
  Parameterized by [logits](https://en.wikipedia.org/wiki/Logit) rather than
  probabilities.
  
  ```python
  dist = Categorical(logits=np.log([0.1, 0.5, 0.4])
  n = 1e4
  empirical_prob = tf.cast(
      tf.histogram_fixed_width(
        dist.sample(int(n)),
        [0., 2],
        nbins=3),
      dtype=tf.float32) / n
  # ==> array([0.1045,  0.5047, 0.3908], dtype=float32)
  ```
  
  Creates a 3-class distribution with the 3rd class being most likely.
  The distribution functions can be evaluated on counts.
  
  ```python
  # counts is a scalar.
  p = [0.1, 0.4, 0.5]
  dist = Categorical(probs=p)
  dist.prob(0)  # Shape []
  
  # p will be broadcast to [[0.1, 0.4, 0.5], [0.1, 0.4, 0.5]] to match counts.
  counts = [1, 0]
  dist.prob(counts)  # Shape [2]
  
  # p will be broadcast to shape [3, 5, 7, 3] to match counts.
  counts = [[...]] # Shape [5, 7, 3]
  dist.prob(counts)  # Shape [5, 7, 3]
  ```
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docstr: Scalar `int32` tensor: the number of classes.
docstr_tok: ["Scalar","`","int32","`","tensor",":","the","number","of","classes","."]
code: def event_size(self):
      """Scalar `int32` tensor: the number of classes."""
      return self._event_size
  
imports: from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import nn_ops
  from tensorflow.python.ops import random_ops
  from tensorflow.python.ops.distributions import distribution
  from tensorflow.python.ops.distributions import kullback_leibler
  from tensorflow.python.ops.distributions import util
  from tensorflow.python.util import deprecation
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 2 for calling the Categorical obj's underlying member method code with example usage: obj.event_size() and returns: self