Random operations

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categorical function

keras.random.categorical(logits, num_samples, dtype="int32", seed=None)

Draws samples from a categorical distribution.

This function takes as input logits, a 2-D input tensor with shape (batch_size, num_classes). Each row of the input represents a categorical distribution, with each column index containing the log-probability for a given class.

The function will output a 2-D tensor with shape (batch_size, num_samples), where each row contains samples from the corresponding row in logits. Each column index contains an independent samples drawn from the input distribution.

Arguments

• logits: 2-D Tensor with shape (batch_size, num_classes). Each row should define a categorical distibution with the unnormalized log-probabilities for all classes.
• num_samples: Int, the number of independent samples to draw for each row of the input. This will be the second dimension of the output tensor's shape.
• dtype: Optional dtype of the output tensor.
• seed: A Python integer or instance of keras.random.SeedGenerator. Used to make the behavior of the initializer deterministic. Note that an initializer seeded with an integer or None (unseeded) will produce the same random values across multiple calls. To get different random values across multiple calls, use as seed an instance of keras.random.SeedGenerator.

Returns

A 2-D tensor with (batch_size, num_samples).

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dropout function

keras.random.dropout(inputs, rate, noise_shape=None, seed=None)

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gamma function

keras.random.gamma(shape, alpha, dtype=None, seed=None)

Draw random samples from the Gamma distribution.

Arguments

• shape: The shape of the random values to generate.
• alpha: Float, the parameter of the distribution.
• dtype: Optional dtype of the tensor. Only floating point types are supported. If not specified, keras.config.floatx() is used, which defaults to float32 unless you configured it otherwise (via keras.config.set_floatx(float_dtype)).
• seed: A Python integer or instance of keras.random.SeedGenerator. Used to make the behavior of the initializer deterministic. Note that an initializer seeded with an integer or None (unseeded) will produce the same random values across multiple calls. To get different random values across multiple calls, use as seed an instance of keras.random.SeedGenerator.

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normal function

keras.random.normal(shape, mean=0.0, stddev=1.0, dtype=None, seed=None)

Draw random samples from a normal (Gaussian) distribution.

Arguments

• shape: The shape of the random values to generate.
• mean: Float, defaults to 0. Mean of the random values to generate.
• stddev: Float, defaults to 1. Standard deviation of the random values to generate.
• dtype: Optional dtype of the tensor. Only floating point types are supported. If not specified, keras.config.floatx() is used, which defaults to float32 unless you configured it otherwise (via keras.config.set_floatx(float_dtype)).
• seed: A Python integer or instance of keras.random.SeedGenerator. Used to make the behavior of the initializer deterministic. Note that an initializer seeded with an integer or None (unseeded) will produce the same random values across multiple calls. To get different random values across multiple calls, use as seed an instance of keras.random.SeedGenerator.

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randint function

keras.random.randint(shape, minval, maxval, dtype="int32", seed=None)

Draw random integers from a uniform distribution.

The generated values follow a uniform distribution in the range [minval, maxval). The lower bound minval is included in the range, while the upper bound maxval is excluded.

dtype must be an integer type.

Arguments

• shape: The shape of the random values to generate.
• minval: Float, defaults to 0. Lower bound of the range of random values to generate (inclusive).
• maxval: Float, defaults to 1. Upper bound of the range of random values to generate (exclusive).
• dtype: Optional dtype of the tensor. Only integer types are supported. If not specified, keras.config.floatx() is used, which defaults to float32 unless you configured it otherwise (via keras.config.set_floatx(float_dtype))
• seed: A Python integer or instance of keras.random.SeedGenerator. Used to make the behavior of the initializer deterministic. Note that an initializer seeded with an integer or None (unseeded) will produce the same random values across multiple calls. To get different random values across multiple calls, use as seed an instance of keras.random.SeedGenerator.

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shuffle function

keras.random.shuffle(x, axis=0, seed=None)

Shuffle the elements of a tensor uniformly at random along an axis.

Arguments

• x: The tensor to be shuffled.
• axis: An integer specifying the axis along which to shuffle. Defaults to 0.
• seed: A Python integer or instance of keras.random.SeedGenerator. Used to make the behavior of the initializer deterministic. Note that an initializer seeded with an integer or None (unseeded) will produce the same random values across multiple calls. To get different random values across multiple calls, use as seed an instance of keras.random.SeedGenerator.

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truncated_normal function

keras.random.truncated_normal(shape, mean=0.0, stddev=1.0, dtype=None, seed=None)

Draw samples from a truncated normal distribution.

The values are drawn from a normal distribution with specified mean and standard deviation, discarding and re-drawing any samples that are more than two standard deviations from the mean.

Arguments

• shape: The shape of the random values to generate.
• mean: Float, defaults to 0. Mean of the random values to generate.
• stddev: Float, defaults to 1. Standard deviation of the random values to generate.
• dtype: Optional dtype of the tensor. Only floating point types are supported. If not specified, keras.config.floatx() is used, which defaults to float32 unless you configured it otherwise (via keras.config.set_floatx(float_dtype))
• seed: A Python integer or instance of keras.random.SeedGenerator. Used to make the behavior of the initializer deterministic. Note that an initializer seeded with an integer or None (unseeded) will produce the same random values across multiple calls. To get different random values across multiple calls, use as seed an instance of keras.random.SeedGenerator.

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uniform function

keras.random.uniform(shape, minval=0.0, maxval=1.0, dtype=None, seed=None)

Draw samples from a uniform distribution.

The generated values follow a uniform distribution in the range [minval, maxval). The lower bound minval is included in the range, while the upper bound maxval is excluded.

dtype must be a floating point type, the default range is [0, 1).

Arguments

• shape: The shape of the random values to generate.
• minval: Float, defaults to 0. Lower bound of the range of random values to generate (inclusive).
• maxval: Float, defaults to 1. Upper bound of the range of random values to generate (exclusive).
• dtype: Optional dtype of the tensor. Only floating point types are supported. If not specified, keras.config.floatx() is used, which defaults to float32 unless you configured it otherwise (via keras.config.set_floatx(float_dtype))
• seed: A Python integer or instance of keras.random.SeedGenerator. Used to make the behavior of the initializer deterministic. Note that an initializer seeded with an integer or None (unseeded) will produce the same random values across multiple calls. To get different random values across multiple calls, use as seed an instance of keras.random.SeedGenerator.