SHOGUN  6.1.3
Block.cpp
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30 
31 #include <algorithm>
32 #include <numeric>
33 #include <shogun/lib/SGVector.h>
36 
37 using namespace shogun;
38 using namespace internal;
39 
40 Block::Block(CFeatures* feats, index_t index, index_t size) : m_feats(feats)
41 {
42  REQUIRE(m_feats!=nullptr, "Underlying feature object cannot be null!\n");
43 
44  // increase the refcount of the underlying feature object
45  // we want this object to be alive till the last block is free'd
46  SG_REF(m_feats);
47 
48  // create a shallow copy and subset current block separately
50 
51  SGVector<index_t> inds(size);
52  std::iota(inds.vector, inds.vector+inds.vlen, index*size);
53  block->add_subset(inds);
54 
55  m_block=block;
56 }
57 
58 Block::Block(const Block& other) : m_block(other.m_block), m_feats(other.m_feats)
59 {
60  SG_REF(m_block);
61  SG_REF(m_feats);
62 }
63 
65 {
66  m_block=other.m_block;
67  m_feats=other.m_feats;
68  SG_REF(m_block);
69  SG_REF(m_feats);
70  return *this;
71 }
72 
74 {
75  SG_UNREF(m_block);
76  SG_UNREF(m_feats);
77 }
78 
79 std::vector<Block> Block::create_blocks(CFeatures* feats, index_t num_blocks, index_t size)
80 {
81  std::vector<Block> vec;
82  for (index_t i=0; i<num_blocks; ++i)
83  vec.push_back(Block(feats, i, size));
84  return vec;
85 }
virtual CFeatures * shallow_subset_copy()
Definition: Features.h:353
static std::vector< Block > create_blocks(CFeatures *feats, index_t num_blocks, index_t size)
Definition: Block.cpp:79
int32_t index_t
Definition: common.h:72
#define REQUIRE(x,...)
Definition: SGIO.h:181
#define SG_REF(x)
Definition: SGObject.h:52
#define SG_UNREF(x)
Definition: SGObject.h:53
all of classes and functions are contained in the shogun namespace
Definition: class_list.h:18
The class Features is the base class of all feature objects.
Definition: Features.h:69
Class that holds a block feature. A block feature is a shallow copy of an underlying (non-owning) fea...
Block & operator=(const Block &other)
Definition: Block.cpp:64
virtual void add_subset(SGVector< index_t > subset)
Definition: Features.cpp:310
Block< Matrix > block(Matrix matrix, index_t row_begin, index_t col_begin, index_t row_size, index_t col_size)

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