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torch.js· 2026
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  4. distributions
  5. constraints
  6. is_dependent

torch.distributions.constraints.is_dependent

function is_dependent(constraint: Constraint | _DependentProperty): boolean

Checks if a constraint is a dependent constraint.

Returns true if the constraint depends on other distribution parameters or depends on the values of the distribution itself (rather than being a fixed constraint). Dependent constraints have their range determined by other parameters. Useful for:

  • Parameter validation: Checking constraint type during distribution construction
  • Distribution implementation: Handling parameter-dependent constraints differently
  • Type detection: Distinguishing dependent from independent constraints
  • Shape computation: Determining event shapes for dependent constraints
  • Constraint implementation: Special handling for parameter-dependent constraints

Dependent constraints are constraints where the valid range depends on the values of other distribution parameters. For example, the concentration parameters of a Dirichlet constraint are dependent on the shape parameter.

  • DependentProperty support: Also works with _DependentProperty objects
  • Type safety: Can be used as a type guard for dependent constraints
  • Distribution-specific: Meaning varies based on distribution type
  • Parameter dependency: Dependent constraints need access to parent distribution
  • Shape computation: Event shape may not be computable for dependent constraints

Parameters

constraintConstraint | _DependentProperty
Constraint or DependentProperty to check

Returns

boolean– True if the constraint is dependent on other parameters, false if independent

Examples

// Check independent constraint
const positive = torch.distributions.constraints.positive;
torch.distributions.is_dependent(positive);  // false
// Check dependent constraint
const dependent = torch.distributions.dependent;
torch.distributions.is_dependent(dependent);  // true
// Use in distribution implementation
function validate_constraint(constraint: Constraint) {
  if (torch.distributions.is_dependent(constraint)) {
    // Handle dependent constraint specially
    return constraint.event_shape;
  } else {
    // Handle independent constraint
    return simpleShape;
  }
}

See Also

  • PyTorch torch.distributions.constraints.is_dependent()
  • dependent - Singleton dependent constraint
  • dependent_discrete - Dependent constraint for discrete spaces
  • Constraint - Base constraint class
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