我在lib/python3.11/site-packages/torch/_C/_VariableFunctions.pyi文件the function is called here中遇到了PyTorch的function _transformer_encoder_layer_fwd。
但是我没有找到关于这个函数的任何细节。为什么可以调用这个函数？如何调用？

def _transformer_encoder_layer_fwd(src: Tensor, embed_dim:
                                   _int, num_heads: _int,
                                   qkv_weight: Tensor,
                                   qkv_bias: Tensor,
                                   proj_weight: Tensor,
                                   proj_bias: Tensor,
                                   use_gelu: _bool,
                                   norm_first: _bool,
                                   eps: _float,
                                   norm_weight_1: Tensor,
                                   norm_bias_1: Tensor,
                                   norm_weight_2: Tensor,
                                   norm_bias_2: Tensor,
                                   ffn_weight_1: Tensor,
                                   ffn_bias_1: Tensor,
                                   ffn_weight_2: Tensor,
                                   ffn_bias_2: Tensor,
                                   mask: Optional[Tensor] = None,
                                   mask_type: Optional[_int] = None) -> Tensor:

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该函数在torch/_C/_VariableFunctions.pyi中定义
我试图找到这个函数的任何细节，关于如何调用这个函数。但没有结果。