def inference(self, x, w, relaxed=False, return_energy=False):
self.inference_calls += 1
# extract unary weights
unary_params = self.get_unary_weights(w)
# extract pairwise weights of shape n_edge_types x n_states x n_states
pairwise_params = self.get_pairwise_weights(w)
edges = _make_grid_edges(x, neighborhood=self.neighborhood,
return_lists=True)
n_edges = [len(e) for e in edges]
# replicate pairwise weights for edges of certain type
edge_weights = [np.repeat(pw[np.newaxis, :, :], n, axis=0)
for pw, n in zip(pairwise_params, n_edges)]
edge_weights = np.vstack(edge_weights)
edges = np.vstack(edges)
#if self.inference_method == "qpbo":
#return _inference_qpbo(x, unary_params, pairwise_params,
#self.neighborhood)
#elif self.inference_method == "dai":
#return _inference_dai(x, unary_params, pairwise_params,
#self.neighborhood)
if self.inference_method == "lp":
return _inference_lp(x, unary_params, edge_weights, edges, relaxed,
return_energy=return_energy)
#elif self.inference_method == "ad3":
#return _inference_ad3(x, unary_params, pairwise_params,
#self.neighborhood, relaxed)
else:
raise ValueError("inference_method must be 'qpbo' or 'dai', got %s"
% self.inference_method)
def inference(self, x, w, relaxed=False):
unary_params = self.get_unary_weights(w)
pairwise_params = self.get_pairwise_weights(w)
self.inference_calls += 1
edges = _make_grid_edges(x, neighborhood=self.neighborhood)
if self.inference_method == "qpbo":
return _inference_qpbo(x, unary_params, pairwise_params,
edges)
elif self.inference_method == "dai":
return _inference_dai(x, unary_params, pairwise_params,
edges)
elif self.inference_method == "lp":
return _inference_lp(x, unary_params, pairwise_params,
edges, relaxed)
elif self.inference_method == "ad3":
return _inference_ad3(x, unary_params, pairwise_params,
edges, relaxed)
else:
raise ValueError("inference_method must be 'qpbo' or 'dai', got %s"
% self.inference_method)
def psi(self, x, y):
# x is unaries
# y is a labeling
if isinstance(y, tuple):
# y can also be continuous (from lp)
# in this case, it comes with accumulated edge marginals
y, pw = y
x_flat = x.reshape(-1, x.shape[-1])
y_flat = y.reshape(-1, y.shape[-1])
unaries_acc = np.sum(x_flat * y_flat, axis=0)
# pw contains separate entries for all edges
# we need to find out which belong to which kind
edges = _make_grid_edges(x, neighborhood=self.neighborhood,
return_lists=True)
n_edges = [len(e) for e in edges]
n_edges.insert(0, 0)
edge_boundaries = np.cumsum(n_edges)
pw_accumulated = []
for i, j in zip(edge_boundaries[:-1], edge_boundaries[1:]):
pw_accumulated.append(pw[i:j].sum(axis=0))
pw = np.hstack(pw_accumulated)
else:
## unary features:
gx, gy = np.ogrid[:x.shape[0], :x.shape[1]]
selected_unaries = x[gx, gy, y]
unaries_acc = np.bincount(y.ravel(), selected_unaries.ravel(),
minlength=self.n_states)
##accumulated pairwise
#make one hot encoding
labels = np.zeros((y.shape[0], y.shape[1], self.n_states),
dtype=np.int)
labels[gx, gy, y] = 1
pw = np.vstack(pairwise_grid_features(labels, self.neighborhood))
feature = np.hstack([unaries_acc, pw.ravel()])
return feature
def init_latent(self, X, Y):
edges = _make_grid_edges(X[0], neighborhood=self.neighborhood,
return_lists=True)
return kmeans_init(X, Y, edges,
n_states_per_label=self.n_states_per_label)
