Random operations

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beta function

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

Draw samples from a Beta distribution.

The values are drawn from a Beta distribution parametrized by alpha and beta.

Arguments

• shape: The shape of the random values to generate.
• alpha: Float or an array of floats representing the first parameter alpha. Must be broadcastable with beta and shape.
• beta: Float or an array of floats representing the second parameter beta. Must be broadcastable with alpha and shape.
• 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: Optional Python integer or instance of keras.random.SeedGenerator. By default, the seed argument is None, and an internal global keras.random.SeedGenerator is used. The seed argument can be used to ensure deterministic (repeatable) random number generation. Note that passing an integer as the seed value will produce the same random values for each call. To generate different random values for repeated calls, an instance of keras.random.SeedGenerator must be provided as the seed value. Remark concerning the JAX backend: When tracing functions with the JAX backend the global keras.random.SeedGenerator is not supported. Therefore, during tracing the default value seed=None will produce an error, and a seed argument must be provided.

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binomial function

keras.random.binomial(shape, counts, probabilities, dtype=None, seed=None)

Draw samples from a Binomial distribution.

The values are drawn from a Binomial distribution with specified trial count and probability of success.

Arguments

• shape: The shape of the random values to generate.
• counts: A number or array of numbers representing the number of trials. It must be broadcastable with probabilities.
• probabilities: A float or array of floats representing the probability of success of an individual event. It must be broadcastable with counts.
• 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: Optional Python integer or instance of keras.random.SeedGenerator. By default, the seed argument is None, and an internal global keras.random.SeedGenerator is used. The seed argument can be used to ensure deterministic (repeatable) random number generation. Note that passing an integer as the seed value will produce the same random values for each call. To generate different random values for repeated calls, an instance of keras.random.SeedGenerator must be provided as the seed value. Remark concerning the JAX backend: When tracing functions with the JAX backend the global keras.random.SeedGenerator is not supported. Therefore, during tracing the default value seed=None will produce an error, and a seed argument must be provided.

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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 distribution 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: Optional Python integer or instance of keras.random.SeedGenerator. By default, the seed argument is None, and an internal global keras.random.SeedGenerator is used. The seed argument can be used to ensure deterministic (repeatable) random number generation. Note that passing an integer as the seed value will produce the same random values for each call. To generate different random values for repeated calls, an instance of keras.random.SeedGenerator must be provided as the seed value. Remark concerning the JAX backend: When tracing functions with the JAX backend the global keras.random.SeedGenerator is not supported. Therefore, during tracing the default value seed=None will produce an error, and a seed argument must be provided.

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: Optional Python integer or instance of keras.random.SeedGenerator. By default, the seed argument is None, and an internal global keras.random.SeedGenerator is used. The seed argument can be used to ensure deterministic (repeatable) random number generation. Note that passing an integer as the seed value will produce the same random values for each call. To generate different random values for repeated calls, an instance of keras.random.SeedGenerator must be provided as the seed value. Remark concerning the JAX backend: When tracing functions with the JAX backend the global keras.random.SeedGenerator is not supported. Therefore, during tracing the default value seed=None will produce an error, and a seed argument must be provided.

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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: Optional Python integer or instance of keras.random.SeedGenerator. By default, the seed argument is None, and an internal global keras.random.SeedGenerator is used. The seed argument can be used to ensure deterministic (repeatable) random number generation. Note that passing an integer as the seed value will produce the same random values for each call. To generate different random values for repeated calls, an instance of keras.random.SeedGenerator must be provided as the seed value. Remark concerning the JAX backend: When tracing functions with the JAX backend the global keras.random.SeedGenerator is not supported. Therefore, during tracing the default value seed=None will produce an error, and a seed argument must be provided.

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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: Optional Python integer or instance of keras.random.SeedGenerator. By default, the seed argument is None, and an internal global keras.random.SeedGenerator is used. The seed argument can be used to ensure deterministic (repeatable) random number generation. Note that passing an integer as the seed value will produce the same random values for each call. To generate different random values for repeated calls, an instance of keras.random.SeedGenerator must be provided as the seed value. Remark concerning the JAX backend: When tracing functions with the JAX backend the global keras.random.SeedGenerator is not supported. Therefore, during tracing the default value seed=None will produce an error, and a seed argument must be provided.

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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: Optional Python integer or instance of keras.random.SeedGenerator. By default, the seed argument is None, and an internal global keras.random.SeedGenerator is used. The seed argument can be used to ensure deterministic (repeatable) random number generation. Note that passing an integer as the seed value will produce the same random values for each call. To generate different random values for repeated calls, an instance of keras.random.SeedGenerator must be provided as the seed value. Remark concerning the JAX backend: When tracing functions with the JAX backend the global keras.random.SeedGenerator is not supported. Therefore, during tracing the default value seed=None will produce an error, and a seed argument must be provided.

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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: Optional Python integer or instance of keras.random.SeedGenerator. By default, the seed argument is None, and an internal global keras.random.SeedGenerator is used. The seed argument can be used to ensure deterministic (repeatable) random number generation. Note that passing an integer as the seed value will produce the same random values for each call. To generate different random values for repeated calls, an instance of keras.random.SeedGenerator must be provided as the seed value. Remark concerning the JAX backend: When tracing functions with the JAX backend the global keras.random.SeedGenerator is not supported. Therefore, during tracing the default value seed=None will produce an error, and a seed argument must be provided.

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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: Optional Python integer or instance of keras.random.SeedGenerator. By default, the seed argument is None, and an internal global keras.random.SeedGenerator is used. The seed argument can be used to ensure deterministic (repeatable) random number generation. Note that passing an integer as the seed value will produce the same random values for each call. To generate different random values for repeated calls, an instance of keras.random.SeedGenerator must be provided as the seed value. Remark concerning the JAX backend: When tracing functions with the JAX backend the global keras.random.SeedGenerator is not supported. Therefore, during tracing the default value seed=None will produce an error, and a seed argument must be provided.