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在理解如何使caffe运行之后，我们要理解它是如何运行的，即了解Solver类的Solve()函数做了什么，对于Solver类中如何初始化网络以及其他参数，有兴趣的可以深入研究。

源码中Solver()函数是有参数形式的

  // The main entry of the solver function. In default, iter will be zero. Pass
  // in a non-zero iter number to resume training for a pre-trained net.
  virtual void Solve(const char* resume_file = NULL);
  inline void Solve(const string resume_file) { Solve(resume_file.c_str()); }

各位一看就明白了吧。再看Solve函数的定义

template <typename Dtype>
void Solver<Dtype>::Solve(const char* resume_file) {
  CHECK(Caffe::root_solver());
  LOG(INFO) << "Solving " << net_->name();
  LOG(INFO) << "Learning Rate Policy: " << param_.lr_policy();

  // Initialize to false every time we start solving.
  requested_early_exit_ = false;

  if (resume_file) {
    LOG(INFO) << "Restoring previo