code: def get_implied_vol(self, time, strike, paths, spot, r, dtype):
      r = tf.convert_to_tensor(r, dtype=dtype)
      discount_factor = tf.math.exp(-r * time)
      paths = tf.boolean_mask(
          paths, tf.math.logical_not(tf.math.is_nan(paths))
      )
      option_value = tf.math.reduce_mean(tf.nn.relu(paths - strike))
      iv = bs.implied_vol(
          prices=discount_factor * option_value,
          strikes=strike,
          expiries=time,
          spots=spot,
          discount_factors=discount_factor,
          dtype=dtype,
          validate_args=True,
      )
      return iv
  
file_path: tf-quant-finance/tf_quant_finance/experimental/local_stochastic_volatility/local_stochastic_volatility_model_test.py
imports: from absl.testing import parameterized
  import numpy
  import tensorflow.compat.v2
  import tf_quant_finance
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 1 for calling the LocalStochasticVolatilityTest obj's underlying member method code with example usage: obj.get_implied_vol(time, strike, paths, spot, r, dtype) and returns: iv