def meshgrid(x, y):
  """Tiles the contents of x and y into a pair of grids.

  Multidimensional analog of numpy.meshgrid, giving the same behavior if x and y
  are vectors. Generally, this will give:

  xgrid(i1, ..., i_m, j_1, ..., j_n) = x(j_1, ..., j_n)
  ygrid(i1, ..., i_m, j_1, ..., j_n) = y(i_1, ..., i_m)

  Keep in mind that the order of the arguments and outputs is reverse relative
  to the order of the indices they go into, done for compatibility with numpy.
  The output tensors have the same shapes.  Specifically:

  xgrid.get_shape() = y.get_shape().concatenate(x.get_shape())
  ygrid.get_shape() = y.get_shape().concatenate(x.get_shape())

  Args:
    x: A tensor of arbitrary shape and rank. xgrid will contain these values
       varying in its last dimensions.
    y: A tensor of arbitrary shape and rank. ygrid will contain these values
       varying in its first dimensions.
  Returns:
    A tuple of tensors (xgrid, ygrid).
  """
  with tf.name_scope('Meshgrid'):
    x = tf.convert_to_tensor(x)
    y = tf.convert_to_tensor(y)
    x_exp_shape = expanded_shape(tf.shape(x), 0, tf.rank(y))
    y_exp_shape = expanded_shape(tf.shape(y), tf.rank(y), tf.rank(x))

    xgrid = tf.tile(tf.reshape(x, x_exp_shape), y_exp_shape)
    ygrid = tf.tile(tf.reshape(y, y_exp_shape), x_exp_shape)
    new_shape = y.get_shape().concatenate(x.get_shape())
    xgrid.set_shape(new_shape)
    ygrid.set_shape(new_shape)

    return xgrid, ygrid
Tiles the contents of x and y into a pair of grids.

  Multidimensional analog of numpy.meshgrid, giving the same behavior if x and y
  are vectors. Generally, this will give:

  xgrid(i1, ..., i_m, j_1, ..., j_n) = x(j_1, ..., j_n)
  ygrid(i1, ..., i_m, j_1, ..., j_n) = y(i_1, ..., i_m)

  Keep in mind that the order of the arguments and outputs is reverse relative
  to the order of the indices they go into, done for compatibility with numpy.
  The output tensors have the same shapes.  Specifically:

  xgrid.get_shape() = y.get_shape().concatenate(x.get_shape())
  ygrid.get_shape() = y.get_shape().concatenate(x.get_shape())

  Args:
    x: A tensor of arbitrary shape and rank. xgrid will contain these values
       varying in its last dimensions.
    y: A tensor of arbitrary shape and rank. ygrid will contain these values
       varying in its first dimensions.
  Returns:
    A tuple of tensors (xgrid, ygrid).
  
inference_api/src/main/object_detection/utils/ops.py