!9686 Fix a bug of naming the variable in LGamma

From: @peixu_ren
Reviewed-by: @zichun_ye,@sunnybeike
Signed-off-by: @sunnybeike

mindspore/nn/layer/math.py

@@ -253,18 +253,18 @@ class LGamma(Cell):
         z = self.select(need_to_reflect, neg_input, x - 1)
 
         @constexpr
-        def _calculate_x(z, k_base_lanczos_coeff, k_lanczos_coefficients):
-            x = k_base_lanczos_coeff
+        def _calculate_reflected_x(z, k_base_lanczos_coeff, k_lanczos_coefficients):
+            reflex_x = k_base_lanczos_coeff
             for i in range(8):
                 product_ = k_lanczos_coefficients[i] / (z + i + 1)
-                x = product_ + x
-            return  x
-        x = _calculate_x(z, self.k_base_lanczos_coeff, self.k_lanczos_coefficients)
+                reflex_x = product_ + reflex_x
+            return  reflex_x
+        reflex_x = _calculate_reflected_x(z, self.k_base_lanczos_coeff, self.k_lanczos_coefficients)
 
         t = z + self.lanczos_gamma_plus_one_half
         log_t = self.log1p(z / self.lanczos_gamma_plus_one_half) + self.log_lanczos_gamma_plus_one_half
 
-        log_y = self.log(x) + (z + self.one_half - t / log_t) * log_t + self.log_sqrt_two_pi
+        log_y = self.log(reflex_x) + (z + self.one_half - t / log_t) * log_t + self.log_sqrt_two_pi
 
         abs_input = self.abs(x)
         abs_frac_input = abs_input - self.floor(abs_input)