def vec_ans_index_encoder_flush(instructions,
precision,
coding_shape,
overflow_width=OVERFLOW_WIDTH,
**kwargs):
message = vrans.empty_message(coding_shape)
overflow_push, _ = substack(codec=None, view_fun=overflow_view)
# LIFO - last item compressed is first item decompressed
for i in reversed(range(len(instructions))):
start, freq, flag, precision_i, mask = instructions[i]
if flag is False:
message = vrans.push(message, start, freq, precision)
else:
# Substack on overflow values
overflow_precision = precision_i
message = overflow_push(message, start, freq, overflow_precision,
mask)
encoded = vrans.flatten(message)
message_length = len(encoded)
print('Symbol compressed to {:.3f} bits.'.format(32 * message_length))
return encoded
def ans_index_encoder_flush(instructions, precision, overflow_width=OVERFLOW_WIDTH, **kwargs):
message = vrans.empty_message(())
# LIFO - last item compressed is first item decompressed
for i in reversed(range(len(instructions))):
start, freq, flag = instructions[i]
if flag is False:
message = vrans.push(message, start, freq, precision)
else:
message = vrans.push(message, start, freq, overflow_width)
encoded = vrans.flatten(message)
message_length = len(encoded)
#print('Symbol compressed to {:.3f} bits.'.format(32 * message_length))
return encoded
def push(message, start, freq, precision, mask):
head, tail = message
view_fun_ = lambda x: view_fun(x, mask)
subhead, update = compression_utils.view_update(head, view_fun_)
subhead, tail = vrans.push((subhead, tail), start, freq, precision)
return update(subhead), tail
def push(message, symbol):
start, freq = enc_statfun(symbol)
return vrans.push(message, start, freq, precision)