void kinect_gbuffer::update(ID3D11DeviceContext* context)
{
if (has_new_color_)
{
update_color(context);
}
if (has_new_depth_)
{
update_depth(context);
}
// reset state
has_new_depth_ = has_new_color_ = false;
}
/*
* Extend mondrian block to include new training data
*/
void MondrianNode::extend_mondrian_block(const Sample& sample) {
if (settings_->debug)
cout << "### extend_mondrian_block: " << endl;
float split_cost = 0.; /* On split_cost depends
if a new split is introduced */
/*
* Set new lower and upper boundary:
* - e_lower = max(l^x_j - x,0)
* - e_upper = min(x - u^x_j,0)
*/
arma::fvec zero_vec(mondrian_block_->get_feature_dim(), arma::fill::zeros);
arma::fvec tmp_min_block = mondrian_block_->get_min_block_dim();
arma::fvec tmp_max_block = mondrian_block_->get_max_block_dim();
arma::fvec e_lower = arma::max(
zero_vec, (tmp_min_block - sample.x));
arma::fvec e_upper = arma::max(
zero_vec, (sample.x - tmp_max_block));
/*
* sample e (expo_param) from exponential distribution with rate
* sum_d( e^l_d + e^u_d )
*/
float expo_param = arma::sum(e_lower) + arma::sum(e_upper);
/* Exponential distribution */
if (!greater_zero(expo_param)) {
split_cost = numeric_limits<float>::infinity();
} else {
/* Exponential distribution */
split_cost = random.rand_exp_distribution(expo_param);
}
/* Check if all labels are identical */
if (pause_mondrian()) {
/* Try to extend a paused Mondrian (labels are not identical) */
assert(is_leaf_);
split_cost = numeric_limits<float>::infinity();
}
/*
* Check if current point lies
* (1) Current point lies within Mondrian Block B^x_j
* (2) Current point lies outside block B^x_j
*/
if (equal(split_cost, max_split_costs_) == true ||
split_cost > max_split_costs_) {
/* (1) Current point lies within Mondrian Block B^x_j */
if (!is_leaf_) {
mondrian_block_->update_range_states(sample.x);
add_training_point_to_node(sample);
/*
* Check split dimension/location to choose left or right node
* and recurse on child
*/
if (sample.x[split_dim_] <= split_loc_) {
assert(id_left_child_node_!=NULL);
id_left_child_node_->extend_mondrian_block(sample);
} else {
assert(id_right_child_node_!=NULL);
id_right_child_node_->extend_mondrian_block(sample);
}
} else {
assert(is_leaf_);
if (!check_if_same_labels(sample)) {
sample_mondrian_block(sample);
}
/* Update after calling function sample_mondrian_block,
* because of new node would take new boundary properties */
mondrian_block_->update_range_states(sample.x);
add_training_point_to_node(sample);
}
} else {
/* (2) Current point lies outside block B^x_j */
/* Initialize new parent node */
int feature_dim = mondrian_block_->get_feature_dim();
arma::fvec min_block = arma::min(mondrian_block_->get_min_block_dim(),
sample.x);
arma::fvec max_block = arma::max(mondrian_block_->get_max_block_dim(),
sample.x);
MondrianNode* new_parent_node = new MondrianNode(num_classes_,
feature_dim, budget_, *id_parent_node_,
min_block, max_block, *settings_, depth_);
/* Set "new_parent_node" as new parent of current node */
/* Pass histogram of current node to new parent node */
new_parent_node->init_update_posterior_node_incremental(*this, sample);
/*
* Sample split dimension \delta, choosing d with probability
* proportional to e^l_d + d^u_d
*/
arma::fvec feat_score = e_lower + e_upper;
/* Problem can occur that min and max boundary value are the same
* at a sampled split location -> solution: sample again until
* it is different */
int split_dim = sample_multinomial_scores(feat_score);
/* Check if it is possible to introduce a split in current dimension */
int max_sample_search = mondrian_block_->get_feature_dim();
int count_sample_search = 0;
while (count_sample_search < max_sample_search) {
if (equal(min_block[split_dim_], max_block[split_dim_])) {
split_dim_ = sample_multinomial_scores(min_block);
} else {
break;
}
count_sample_search += 1;
}
float split_loc = 0.0; /* Split location */
/*
* Sample split location \xi uniformly from interval
* [u^x_{j,\delta},x_\delta] if x_\delta > u^x_{j,\delta}
* [x_delta, l^x_{j,\delta}] else
*/
if (sample.x[split_dim] > mondrian_block_->get_max_block_dim()
[split_dim]) {
split_loc = random.rand_uniform_distribution(
mondrian_block_->get_min_block_dim()[split_dim],
sample.x[split_dim]);
} else {
split_loc = random.rand_uniform_distribution(sample.x[split_dim],
mondrian_block_->get_min_block_dim()[split_dim]);
}
float new_budget = budget_ - split_cost;
/*
* Insert a new node (j~) just above node j in the tree,
* and a new leaf'', sibling to j
*/
bool is_left_node = false;
arma::fvec new_child_block(mondrian_block_->get_feature_dim());
if (sample.x[split_dim] > split_loc) {
is_left_node = true;
new_child_block = max_block;
} else {
new_child_block = min_block;
}
/* Grow Mondrian child node of the "outer Mondrian" */
int new_depth = depth_ +1;
MondrianNode* child_node = new MondrianNode(num_classes_,
feature_dim, new_budget, *new_parent_node,
new_child_block, new_child_block, *settings_, new_depth);
/* Set child nodes of new created parent node ("new_parent_node") */
new_parent_node->set_child_node(*child_node, (!is_left_node));
new_parent_node->set_child_node(*this, is_left_node);
new_parent_node->is_leaf_ = false;
/* Set "new_parent_node" as new child node of current parent node */
if (id_parent_node_ != NULL ) { /* root node */
if (id_parent_node_->id_left_child_node_ == this) {
id_parent_node_->set_child_node(*new_parent_node, true);
} else {
id_parent_node_->set_child_node(*new_parent_node, false);
}
}
/* Set "new_parent_node" as new parent of current node */
id_parent_node_ = new_parent_node;
/*
* Initialize posterior of new created child node
* (initialize histogram with zeros -> pointer = NULL)
*/
MondrianNode* tmp_node = NULL;
child_node->init_update_posterior_node_incremental(*tmp_node, sample);
child_node->sample_mondrian_block(sample);
budget_ = new_budget;
/* Update split cost of current and new parent node */
new_parent_node->max_split_costs_ = split_cost;
new_parent_node->split_loc_ = split_loc;
new_parent_node->split_dim_ = split_dim;
max_split_costs_ -= split_cost;
update_depth();
}
}
/* ------------------------------------------------------------------------
@NAME : bt_split_list()
@INPUT : string - string to split up; whitespace must be collapsed
eg. by bt_postprocess_string()
delim - delimiter to use; must be lowercase and should be
free of whitespace (code requires that delimiters
in string be surrounded by whitespace)
filename - source of string (for warning messages)
line - 1-based line number into file (for warning messages)
description - what substrings are (eg. "name") (for warning
messages); if NULL will use "substring"
@OUTPUT : substrings (*substrings is allocated by bt_split_list() for you)
@RETURNS : number of substrings found
@DESCRIPTION: Splits a string using a fixed delimiter, in the BibTeX way:
* delimiters at beginning or end of string are ignored
* delimiters in string must be surrounded by whitespace
* case insensitive
* delimiters at non-zero brace depth are ignored
The list of substrings is returned as *substrings, which
is an array of pointers into a duplicate of string. This
duplicate copy has been scribbled on such that there is
a nul byte at the end of every substring. You should
call bt_free_list() to free both the duplicate copy
of string and *substrings itself. Do *not* walk over
the array free()'ing the substrings yourself, as this is
invalid -- they were not malloc()'d!
@GLOBALS :
@CALLS :
@CALLERS : anyone (exported by library)
@CREATED : 1997/05/05, GPW
@MODIFIED :
-------------------------------------------------------------------------- */
bt_stringlist *
bt_split_list (char * string,
char * delim,
char * filename,
int line,
char * description)
{
int depth; /* brace depth */
int i, j; /* offset into string and delim */
int inword; /* flag telling if prev. char == ws */
int string_len;
int delim_len;
int maxdiv; /* upper limit on no. of divisions */
int maxoffs; /* max offset of delim in string */
int numdiv; /* number of divisions */
int * start; /* start of each division */
int * stop; /* stop of each division */
bt_stringlist *
list; /* structure to return */
if (string == NULL)
return NULL;
if (description == NULL)
description = "substring";
string_len = strlen (string);
delim_len = strlen (delim);
maxdiv = (string_len / delim_len) + 1;
maxoffs = string_len - delim_len + 1;
/*
* This is a bit of a band-aid solution to the "split empty string"
* bug (formerly hit the internal_error() at the end of hte function).
* Still need a general "detect and fix unpreprocessed string" --
* admittedly a different bug/misfeature.
*/
if (string_len == 0)
return NULL;
start = (int *) alloca (maxdiv * sizeof (int));
stop = (int *) alloca (maxdiv * sizeof (int));
list = (bt_stringlist *) malloc (sizeof (bt_stringlist));
depth = 0;
i = j = 0;
inword = 1; /* so leading delim ignored */
numdiv = 0;
start[0] = 0; /* first substring @ start of string */
while (i < maxoffs)
{
/* does current char. in string match current char. in delim? */
if (depth == 0 && !inword && tolower (string[i]) == delim[j])
{
j++; i++;
/* have we found an entire delim, followed by a space? */
if (j == delim_len && string[i] == ' ')
{
stop[numdiv] = i - delim_len - 1;
start[++numdiv] = ++i;
j = 0;
#if DEBUG
printf ("found complete delim; i == %d, numdiv == %d: "
"stop[%d] == %d, start[%d] == %d\n",
i, numdiv,
numdiv-1, stop[numdiv-1],
numdiv, start[numdiv]);
#endif
}
}
/* no match between string and delim, at non-zero depth, or in a word */
else
{
update_depth (string, i, depth);
inword = (i < string_len) && (string[i] != ' ');
i++;
j = 0;
}
}
stop[numdiv] = string_len; /* last substring ends just past eos */
list->num_items = numdiv+1;
/*
* OK, now we know how many divisions there are and where they are --
* so let's split that string up for real!
*
* list->items will be an array of pointers into a duplicate of
* `string'; we duplicate `string' so we can safely scribble on it and
* free() it later (in bt_free_list()).
*/
list->items = (char **) malloc (list->num_items * sizeof (char *));
list->string = strdup (string);
for (i = 0; i < list->num_items; i++)
{
/*
* Possible cases:
* - stop < start is for empty elements, e.g. "and and" seen in
* input. (`start' for empty element will be the 'a' of the
* second 'and', and its stop will be the ' ' *before* the
* second 'and'.)
* - stop > start is for anything else between two and's (the usual)
* - stop == start should never happen if the loop above is correct
*/
if (stop[i] > start[i]) /* the usual case */
{
list->string[stop[i]] = 0;
list->items[i] = list->string+start[i];
}
else if (stop[i] < start[i]) /* empty element */
{
list->items[i] = NULL;
general_error (BTERR_CONTENT, filename, line,
description, i+1, "empty %s", description);
}
else /* should not happen! */
{
internal_error ("stop == start for substring %d", i);
}
}
return list;
/* return num_substrings; */
} /* bt_split_list () */
/* ------------------------------------------------------------------------
@NAME : find_tokens
@INPUT : name - string to tokenize (should be a private copy
that we're free to clobber and mangle)
@OUTPUT : comma_token- number of token immediately preceding each comma
(caller must allocate with at least one element
per comma in `name')
@RETURNS : newly-allocated bt_stringlist structure
@DESCRIPTION: Finds tokens in a string; delimiter is space or comma at
brace-depth zero. Assumes whitespace has been collapsed
and find_commas has been run on the string to remove
whitespace around commas and any trailing commas.
The bt_stringlist structure returned can (and should) be
freed with bt_free_list().
@GLOBALS :
@CALLS :
@CALLERS : bt_split_name()
@CREATED : 1997/05/14, Greg Ward
@MODIFIED :
-------------------------------------------------------------------------- */
static bt_stringlist *
find_tokens (char * name,
int * comma_token)
{
int i; /* index into name */
int num_tok;
int in_boundary; /* previous char was ' ' or ',' */
int cur_comma; /* index into comma_token */
int len;
int depth;
bt_stringlist *
tokens;
i = 0;
in_boundary = 1; /* so first char will start a token */
cur_comma = 0;
len = strlen (name);
depth = 0;
tokens = (bt_stringlist *) malloc (sizeof (bt_stringlist));
/* tokens->string = name ? strdup (name) : NULL; */
tokens->string = name;
num_tok = 0;
tokens->items = NULL;
if (len == 0) /* empty string? */
return tokens; /* return empty token list */
tokens->items = (char **) malloc (sizeof (char *) * len);
while (i < len)
{
if (depth == 0 && in_boundary) /* at start of a new token */
{
tokens->items[num_tok++] = name+i;
}
if (depth == 0 && (name[i] == ' ' || name[i] == ','))
{
/* if we're at a comma, record the token preceding the comma */
if (name[i] == ',')
{
comma_token[cur_comma++] = num_tok-1;
}
/*
* if already in a boundary zone, we have an empty token
* (caused by multiple consecutive commas)
*/
if (in_boundary)
{
tokens->items[num_tok-1] = NULL;
}
/* in any case, mark the end of one token and prepare for the
* start of the next
*/
name[i] = (char) 0;
in_boundary = 1;
}
else
{
in_boundary = 0; /* inside a token */
}
update_depth (name, i, depth);
i++;
} /* while i */
tokens->num_items = num_tok;
return tokens;
} /* find_tokens() */
/* ------------------------------------------------------------------------
@NAME : find_commas
@INPUT : name - string to search for commas
max_commas - maximum number of commas to allow (if more than
this number are seen, a warning is printed and
the excess commas are removed)
@OUTPUT :
@RETURNS : number of commas found
@DESCRIPTION: Counts and records positions of commas at brace-depth 0.
Modifies string in-place to remove whitespace around commas,
excess commas, and any trailing commas; warns on excess or
trailing commas. Excess commas are removed by replacing them
with space and calling bt_postprocess_string() to collapse
whitespace a second time; trailing commas are simply replaced
with (char) 0 to truncate the string.
Assumes whitespace has been collapsed (ie. no space at
beginning or end of string, and all internal strings of
whitespace reduced to exactly one space).
@GLOBALS :
@CALLS : name_warning() (if too many commas, or commas at end)
@CALLERS : bt_split_name()
@CREATED : 1997/05/14, Greg Ward
@MODIFIED :
-------------------------------------------------------------------------- */
static int
find_commas (name_loc * loc, char *name, int max_commas)
{
int i, j;
int depth;
int num_commas;
int len;
boolean at_comma;
boolean warned;
i = j = 0;
depth = 0;
num_commas = 0;
len = strlen (name);
warned = 0;
/* First pass to check for and blank out excess commas */
for (i = 0; i < len; i++)
{
update_depth (name, i, depth);
if (depth == 0 && name[i] == ',')
{
num_commas++;
if (num_commas > max_commas)
{
if (! warned)
{
name_warning (loc, "too many commas in name (removing extras)");
warned = TRUE;
}
name[i] = ' ';
}
}
}
/*
* If we blanked out a comma, better re-collapse whitespace. (This is
* a bit of a cop-out -- I could probably adjust i and j appropriately
* in the above loop to do the collapsing for me, but my brain
* hurt when I tried to think it through. Some other time, perhaps.
*/
if (warned)
bt_postprocess_string (name, 1);
/* Now the real comma-finding loop (only if necessary) */
if (num_commas == 0)
return 0;
num_commas = 0;
i = 0;
while (i < len)
{
at_comma = (depth == 0 && name[i] == ',');
if (at_comma)
{
while (j > 0 && name[j-1] == ' ') j--;
num_commas++;
}
update_depth (name, i, depth);
if (i != j)
name[j] = name[i];
i++; j++;
if (at_comma)
{
while (i < len && name[i] == ' ') i++;
}
} /* while i */
if (i != j) name[j] = (char) 0;
j--;
if (name[j] == ',')
{
name_warning (loc, "comma(s) at end of name (removing)");
while (name[j] == ',')
{
name[j--] = (char) 0;
num_commas--;
}
}
return num_commas;
} /* find_commas() */
