docstr: Return the focal length in the x-direction.
  
  Note that the focal lengths of the rectified left and right
  camera are assumed to be equal.
  
  Returns:
      tensor of shape :math:`(B)`
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code: def fx(self) -> Tensor:
      r"""Return the focal length in the x-direction.
  
      Note that the focal lengths of the rectified left and right
      camera are assumed to be equal.
  
      Returns:
          tensor of shape :math:`(B)`
      """
      return self.rectified_left_camera[..., 0, 0]
  
imports: from typing import Any
  import torch
  from kornia.core import Tensor, stack, zeros
  from kornia.geometry.linalg import transform_points
  from kornia.utils.grid import create_meshgrid
label_desc: Use image node_id 4 for calling the StereoCamera obj's underlying member method code with example usage: obj.fx() and returns: self