parameters: (image, lower, upper, seed=None)
return_statement: return adjust_contrast(image, contrast_factor)
docstring: Adjust the contrast of an image or images by a random factor.
  
    Equivalent to `adjust_contrast()` but uses a `contrast_factor` randomly
    picked in the interval `[lower, upper]`.
  
    Args:
      image: An image tensor with 3 or more dimensions.
      lower: float.  Lower bound for the random contrast factor.
      upper: float.  Upper bound for the random contrast factor.
      seed: A Python integer. Used to create a random seed. See
        `tf.compat.v1.set_random_seed` for behavior.
  
    Returns:
      The contrast-adjusted image(s).
  
    Raises:
      ValueError: if `upper <= lower` or if `lower < 0`.
docstring_summary: Adjust the contrast of an image or images by a random factor.
docstring_tokens: Adjust the contrast of an image or images by a random factor .
function: def random_contrast(image, lower, upper, seed=None):
    """Adjust the contrast of an image or images by a random factor.
  
    Equivalent to `adjust_contrast()` but uses a `contrast_factor` randomly
    picked in the interval `[lower, upper]`.
  
    Args:
      image: An image tensor with 3 or more dimensions.
      lower: float.  Lower bound for the random contrast factor.
      upper: float.  Upper bound for the random contrast factor.
      seed: A Python integer. Used to create a random seed. See
        `tf.compat.v1.set_random_seed` for behavior.
  
    Returns:
      The contrast-adjusted image(s).
  
    Raises:
      ValueError: if `upper <= lower` or if `lower < 0`.
    """
    if upper <= lower:
      raise ValueError('upper must be > lower.')
  
    if lower < 0:
      raise ValueError('lower must be non-negative.')
  
    # Generate an a float in [lower, upper]
    contrast_factor = random_ops.random_uniform([], lower, upper, seed=seed)
    return adjust_contrast(image, contrast_factor)
function_tokens: def random_contrast ( image , lower , upper , seed = None ) : if upper <= lower : raise ValueError ( 'upper must be > lower.' ) if lower < 0 : raise ValueError ( 'lower must be non-negative.' ) # Generate an a float in [lower, upper] contrast_factor = random_ops . random_uniform ( [ ] , lower , upper , seed = seed ) return adjust_contrast ( image , contrast_factor )