code: def lognormal(mean=0.0, sigma=1.0, size=None):
      ret = ivy.exp(
          ivy.random_normal(
              mean=mean, std=sigma, shape=size, dtype="float64"
          )
      )
      return ret
  
imports: import ivy
  from ivy.functional.frontends.numpy.func_wrapper import to_ivy_arrays_and_back, from_zero_dim_arrays_to_scalar
  from ivy import with_supported_dtypes
label_desc: Use image node_id 13 for calling a global function with example usage: lognormal(mean, sigma, size) and returns: ret