def main():
X, Y = toy.generate_crosses(n_samples=20, noise=5, n_crosses=1,
total_size=8)
X_train, X_test, Y_train, Y_test = train_test_split(X, Y, test_size=.5)
n_labels = len(np.unique(Y_train))
crf = LatentGridCRF(n_labels=n_labels, n_states_per_label=[1, 2],
inference_method='lp')
clf = LatentSSVM(problem=crf, max_iter=50, C=1000., verbose=2,
check_constraints=True, n_jobs=-1, break_on_bad=True)
clf.fit(X_train, Y_train)
i = 0
for X_, Y_, H, name in [[X_train, Y_train, clf.H_init_, "train"],
[X_test, Y_test, [None] * len(X_test), "test"]]:
Y_pred = clf.predict(X_)
score = clf.score(X_, Y_)
for x, y, h_init, y_pred in zip(X_, Y_, H, Y_pred):
fig, ax = plt.subplots(4, 1)
ax[0].matshow(y, vmin=0, vmax=crf.n_labels - 1)
ax[0].set_title("Ground truth")
ax[1].matshow(np.argmax(x, axis=-1), vmin=0, vmax=crf.n_labels - 1)
ax[1].set_title("Unaries only")
#if h_init is None:
#ax[1, 0].set_visible(False)
#else:
#ax[1, 0].matshow(h_init, vmin=0, vmax=crf.n_states - 1)
#ax[1, 0].set_title("latent initial")
#ax[2].matshow(crf.latent(x, y, clf.w),
#vmin=0, vmax=crf.n_states - 1)
#ax[2].set_title("latent final")
ax[2].matshow(crf.inference(x, clf.w), vmin=0, vmax=crf.n_states
- 1)
ax[2].set_title("Prediction for h")
ax[3].matshow(y_pred, vmin=0, vmax=crf.n_labels - 1)
ax[3].set_title("Prediction for y")
for a in ax.ravel():
a.set_xticks(())
a.set_yticks(())
plt.subplots_adjust(hspace=.5)
fig.savefig("data_%s_%03d.png" % (name, i), bbox_inches="tight",
dpi=400)
i += 1
print("score %s set: %f" % (name, score))
print(clf.w)
def main():
X, Y = toy.generate_crosses(n_samples=40,
noise=8,
n_crosses=2,
total_size=10)
X_train, X_test, Y_train, Y_test = train_test_split(X, Y, test_size=.5)
n_labels = len(np.unique(Y_train))
crf = LatentGridCRF(n_labels=n_labels,
n_states_per_label=2,
inference_method='lp')
clf = LatentSSVM(problem=crf,
max_iter=50,
C=1000.,
verbose=2,
check_constraints=True,
n_jobs=-1,
break_on_bad=True,
plot=True)
clf.fit(X_train, Y_train)
for X_, Y_, H, name in [[X_train, Y_train, clf.H_init_, "train"],
[X_test, Y_test, [None] * len(X_test), "test"]]:
Y_pred = clf.predict(X_)
i = 0
loss = 0
for x, y, h_init, y_pred in zip(X_, Y_, H, Y_pred):
loss += np.sum(y != y_pred / crf.n_states_per_label)
fig, ax = plt.subplots(3, 2)
ax[0, 0].matshow(y * crf.n_states_per_label,
vmin=0,
vmax=crf.n_states - 1)
ax[0, 0].set_title("ground truth")
unary_params = np.repeat(np.eye(2), 2, axis=1)
pairwise_params = np.zeros(10)
w_unaries_only = np.hstack(
[unary_params.ravel(),
pairwise_params.ravel()])
unary_pred = crf.inference(x, w_unaries_only)
ax[0, 1].matshow(unary_pred, vmin=0, vmax=crf.n_states - 1)
ax[0, 1].set_title("unaries only")
if h_init is None:
ax[1, 0].set_visible(False)
else:
ax[1, 0].matshow(h_init, vmin=0, vmax=crf.n_states - 1)
ax[1, 0].set_title("latent initial")
ax[1, 1].matshow(crf.latent(x, y, clf.w),
vmin=0,
vmax=crf.n_states - 1)
ax[1, 1].set_title("latent final")
ax[2, 0].matshow(y_pred, vmin=0, vmax=crf.n_states - 1)
ax[2, 0].set_title("prediction")
ax[2, 1].matshow(
(y_pred // crf.n_states_per_label) * crf.n_states_per_label,
vmin=0,
vmax=crf.n_states - 1)
ax[2, 1].set_title("prediction")
for a in ax.ravel():
a.set_xticks(())
a.set_yticks(())
fig.savefig("data_%s_%03d.png" % (name, i), bbox_inches="tight")
i += 1
print("loss %s set: %f" % (name, loss))
print(clf.w)
