File: error_messages.h

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#pragma once

#include <sstream>

namespace torch::autograd::utils {

inline std::string requires_grad_leaf_error(bool requires_grad) {
  std::ostringstream oss;
  oss << "you can only change requires_grad flags of leaf variables.";
  if (requires_grad == false) {
    oss << " If you want to use a computed variable in a subgraph "
           "that doesn't require differentiation use "
           "var_no_grad = var.detach().";
  }
  return oss.str();
}

} // namespace torch::autograd::utils