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  /external/ceres-solver/internal/ceres/
low_rank_inverse_hessian.h 77 // domain of Hessian, and delta_gradient is the change in the
78 // gradient. The update copies the delta_x and delta_gradient
79 // vectors, and gets rid of the oldest delta_x and delta_gradient
82 bool Update(const Vector& delta_x, const Vector& delta_gradient);
line_search_direction.cc 176 const Vector delta_gradient = current.gradient - previous.gradient; local
177 const double delta_x_dot_delta_gradient = delta_x.dot(delta_gradient);
218 delta_x_dot_delta_gradient / delta_gradient.dot(delta_gradient);
225 // using: y_k = delta_gradient, s_k = delta_x:
257 Matrix A = delta_x * (delta_gradient.transpose() *
262 (1.0 + (rho_k * delta_gradient.transpose() *
264 delta_gradient));
low_rank_inverse_hessian.cc 53 const Vector& delta_gradient) {
54 const double delta_x_dot_delta_gradient = delta_x.dot(delta_gradient);
81 delta_gradient_history_.col(num_corrections_ - 1) = delta_gradient;
85 delta_x_dot_delta_gradient / delta_gradient.squaredNorm();

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