75 	double lx = SV->pop_back();  in calc_eval_function()  local
79 		x = lx + rx;  in calc_eval_function()
82 		x = lx - rx;  in calc_eval_function()
85 		x = lx * rx;  in calc_eval_function()
88 		x = lx / rx;  in calc_eval_function()
91 		x = pow(lx,rx);  in calc_eval_function()
133 	double lx = SV->pop_back();  in calc_grad_reverse_0()  local
138 		x = lx + rx;  in calc_grad_reverse_0()
143 		x = lx - rx;  in calc_grad_reverse_0()
148 		x = lx * rx;  in calc_grad_reverse_0()
150 		r_dh = lx;  in calc_grad_reverse_0()
153 		x = lx / rx;  in calc_grad_reverse_0()
155 		r_dh = -(lx) / pow(rx, 2);  in calc_grad_reverse_0()
159 			x = pow(lx,rx);  in calc_grad_reverse_0()
160 			l_dh = rx*pow(lx,(rx-1));  in calc_grad_reverse_0()
164 			assert(lx>0.0); //otherwise log(lx) is not defined in read number  in calc_grad_reverse_0()
165 			x = pow(lx,rx);  in calc_grad_reverse_0()
166 			l_dh = rx*pow(lx,(rx-1));  in calc_grad_reverse_0()
167 …r_dh = pow(lx,rx)*log(lx);  //this is for x1^x2 when x1=0 cause r_dh become +inf, however d(0^x2)/…  in calc_grad_reverse_0()
205 		double lx,lx_bar,lw,lw_bar;  in hess_reverse_0()  local
209 		left->hess_reverse_0_get_values(lindex,lx,lx_bar,lw,lw_bar);  in hess_reverse_0()
214 			x = lx + rx;  in hess_reverse_0()
224 			x = lx - rx;  in hess_reverse_0()
232 			x = lx * rx;  in hess_reverse_0()
235 			r_dh = lx;  in hess_reverse_0()
240 			x = lx / rx;  in hess_reverse_0()
243 			r_dh = -lx/pow(rx,2);  in hess_reverse_0()
250 				x = pow(lx,rx);  in hess_reverse_0()
252 				l_dh = rx*pow(lx,(rx-1));  in hess_reverse_0()
259 				assert(lx>0.0); //otherwise log(lx) undefined in real number  in hess_reverse_0()
260 				x = pow(lx,rx);  in hess_reverse_0()
262 				l_dh = rx*pow(lx,(rx-1));  in hess_reverse_0()
263 				r_dh = pow(lx,rx)*log(lx);   //log(lx) cause -inf when lx=0;  in hess_reverse_0()
312 		double lw=0,lx=0; left->hess_reverse_1_get_xw(lindex,lw,lx);  in hess_reverse_1()  local
330 			assert(lx == r_dh);  in hess_reverse_1()
333 			rw_bar += w_bar*lx;  in hess_reverse_1()
340 			rw_bar += x_bar*lw*-1/pow(rx,2) + x_bar*rw*2*lx/pow(rx,3);  in hess_reverse_1()
345 				lw_bar += x_bar*lw*pow(lx,rx-2)*rx*(rx-1) + 0;  in hess_reverse_1()
350 				assert(lx>0.0); //otherwise log(lx) is not define in Real  in hess_reverse_1()
352 …lw_bar += x_bar*lw*pow(lx,rx-2)*rx*(rx-1) + x_bar*rw*pow(lx,rx-1)*(rx*log(lx)+1);  //cause log(lx)…  in hess_reverse_1()
354 				rw_bar += x_bar*lw*pow(lx,rx-1)*(rx*log(lx)+1) + x_bar*rw*pow(lx,rx)*pow(log(lx),2);  in hess_reverse_1()