blob.h

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/******************************************************************************
 * Copyright 2018 The Apollo Authors. All Rights Reserved.
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#pragma once

#include <memory>
#include <string>
#include <vector>

#include "cyber/common/log.h"
#include "modules/perception/base/syncedmem.h"

namespace apollo {
namespace perception {
namespace base {

const int kMaxBlobAxes = 32;

template <typename Dtype>
class Blob {
 public:
  Blob() : data_(), count_(0), capacity_(0), use_cuda_host_malloc_(false) {}
  explicit Blob(bool use_cuda_host_malloc)
      : data_(),
        count_(0),
        capacity_(0),
        use_cuda_host_malloc_(use_cuda_host_malloc) {}

  Blob(const int num, const int channels, const int height, const int width,
       const bool use_cuda_host_malloc = false);
  explicit Blob(const std::vector<int>& shape,
                const bool use_cuda_host_malloc = false);

  Blob(const Blob&) = delete;
  void operator=(const Blob&) = delete;

  void Reshape(const int num, const int channels, const int height,
               const int width);
  void Reshape(const std::vector<int>& shape);
  void ReshapeLike(const Blob& other);
  inline std::string shape_string() const {
    std::ostringstream stream;
    for (int i = 0; i < shape_.size(); ++i) {
      stream << shape_[i] << " ";
    }
    stream << "(" << count_ << ")";
    return stream.str();
  }
  inline const std::vector<int>& shape() const { return shape_; }
  inline int shape(int index) const {
    return shape_[CanonicalAxisIndex(index)];
  }
  inline int num_axes() const { return static_cast<int>(shape_.size()); }
  inline int count() const { return count_; }

  inline int count(int start_axis, int end_axis) const {
    CHECK_LE(start_axis, end_axis);
    CHECK_GE(start_axis, 0);
    CHECK_GE(end_axis, 0);
    CHECK_LE(start_axis, num_axes());
    CHECK_LE(end_axis, num_axes());
    int count = 1;
    for (int i = start_axis; i < end_axis; ++i) {
      count *= shape(i);
    }
    return count;
  }
  inline int count(int start_axis) const {
    return count(start_axis, num_axes());
  }

  // const Blob<Dtype> operator ()(const std::vector<int> &roi_start,
  //                               const std::vector<int> &roi_end) const {
  // }

  inline int CanonicalAxisIndex(int axis_index) const {
    CHECK_GE(axis_index, -num_axes())
        << "axis " << axis_index << " out of range for " << num_axes()
        << "-D Blob with shape " << shape_string();
    CHECK_LT(axis_index, num_axes())
        << "axis " << axis_index << " out of range for " << num_axes()
        << "-D Blob with shape " << shape_string();
    if (axis_index < 0) {
      return axis_index + num_axes();
    }
    return axis_index;
  }

  inline int num() const { return LegacyShape(0); }
  inline int channels() const { return LegacyShape(1); }
  inline int height() const { return LegacyShape(2); }
  inline int width() const { return LegacyShape(3); }
  inline int LegacyShape(int index) const {
    CHECK_LE(num_axes(), 4)
        << "Cannot use legacy accessors on Blobs with > 4 axes.";
    CHECK_LT(index, 4);
    CHECK_GE(index, -4);
    if (index >= num_axes() || index < -num_axes()) {
      // Axis is out of range, but still in [0, 3] (or [-4, -1] for reverse
      // indexing) -- this special case simulates the one-padding used to fill
      // extraneous axes of legacy blobs.
      return 1;
    }
    return shape(index);
  }

  inline int offset(const int n, const int c = 0, const int h = 0,
                    const int w = 0) const {
    CHECK_GE(n, 0);
    CHECK_LE(n, num());
    CHECK_GE(channels(), 0);
    CHECK_LE(c, channels());
    CHECK_GE(height(), 0);
    CHECK_LE(h, height());
    CHECK_GE(width(), 0);
    CHECK_LE(w, width());
    return ((n * channels() + c) * height() + h) * width() + w;
  }

  inline int offset(const std::vector<int>& indices) const {
    CHECK_LE(indices.size(), num_axes());
    int offset = 0;
    for (int i = 0; i < num_axes(); ++i) {
      offset *= shape(i);
      if (indices.size() > i) {
        CHECK_GE(indices[i], 0);
        CHECK_LT(indices[i], shape(i));
        offset += indices[i];
      }
    }
    return offset;
  }
  void CopyFrom(const Blob<Dtype>& source, bool reshape = false);

  inline Dtype data_at(const int n, const int c, const int h,
                       const int w) const {
    return cpu_data()[offset(n, c, h, w)];
  }

  inline Dtype data_at(const std::vector<int>& index) const {
    return cpu_data()[offset(index)];
  }

  inline const std::shared_ptr<SyncedMemory>& data() const {
    CHECK(data_);
    return data_;
  }

  const Dtype* cpu_data() const;
  void set_cpu_data(Dtype* data);
  const int* gpu_shape() const;
  const Dtype* gpu_data() const;
  void set_gpu_data(Dtype* data);
  Dtype* mutable_cpu_data();
  Dtype* mutable_gpu_data();
  void set_head_gpu() { data_->set_head_gpu(); }
  void set_head_cpu() { data_->set_head_cpu(); }
  SyncedMemory::SyncedHead head() const { return data_->head(); }

  void ShareData(const Blob& other);

 protected:
  std::shared_ptr<SyncedMemory> data_;
  std::shared_ptr<SyncedMemory> shape_data_;
  std::vector<int> shape_;
  int count_;
  int capacity_;
  bool use_cuda_host_malloc_;
};  // class Blob

template <typename Dtype>
using BlobPtr = std::shared_ptr<Blob<Dtype>>;
template <typename Dtype>
using BlobConstPtr = std::shared_ptr<const Blob<Dtype>>;

}  // namespace base
}  // namespace perception
}  // namespace apollo