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43   bool NextDirection(const LineSearchMinimizer::State& previous,
59   bool NextDirection(const LineSearchMinimizer::State& previous,
66         beta = current.gradient_squared_norm / previous.gradient_squared_norm;
69         gradient_change = current.gradient - previous.gradient;
71                 previous.gradient_squared_norm);
74         gradient_change = current.gradient - previous.gradient;
76                  previous.search_direction.dot(gradient_change));
82     *search_direction =  -current.gradient + beta * previous.search_direction;
111   bool NextDirection(const LineSearchMinimizer::State& previous,
120         previous.search_direction * previous.step_size,
121         current.gradient - previous.gradient);
166   bool NextDirection(const LineSearchMinimizer::State& previous,
174     const Vector delta_x = previous.search_direction * previous.step_size;
175     const Vector delta_gradient = current.gradient - previous.gradient;