def __init__(my, size = 32): my.states = size

def resize(this, bits):

n, max = 0, 1

for bit in bits:

n += bit * max

max <<= 1

n = int(round(n / float(max) * this.states)) - 1

max, bits = 1, []

while(max < this.states):

bits.append((n & max) / max)

max <<= 1

train, limit = 10, 100

bits = 8

time = 8

blur = None

same = False

class lnx:

l, n = 1, 2

@property

def _clone(this):

copy = lnx()

copy.l, copy.n = this.l, this.n

return copy

def __add__(this, bit):

bit, learn, limit = bit

this.l += bit * learn

this.n += learn

if this.n > limit: this.n /= 2.; this.l /= 2.

def __call__(set, weight): return set.l * weight, set.n * weight

def __init__(context, **params):

context.set(_codes=[], _last=None, **params)

def clone(this, **changes):

copy = AWC()

copy.set(**this._clonable)

copy.set(**changes)

copy.update(this)

for context in copy: copy[context] = copy[context]._clone

return copy

def _make(actual, set):

actual._codes, context = [], []

for bits in set:

context += bits

actual._codes.append(tuple(context))

def __call__(actual):

l, n, w = 1., 2., 1

for length, context in enumerate(actual._codes):

w *= len(context)

if context in actual:

_l, _n = actual[context](w)

l += _l; n += _n

else: actual[context] = AWC.lnx()

return l/n

def __add__(last, bit):

for context in last._codes: last[context] + bit

def learn(symbol, data=None, file=None, tell=False):

if file: data = unpackbits(fromfile(file, dtype = 'ubyte'))

check, to = None, 0.

if tell: check = tell*len(data)

train, limit = symbol.train, symbol.limit

set, coded, time = [], [], symbol.time

while time: set.append(list()); time -= 1

for n, bit in enumerate(data.tolist()):

if tell and n%check==0: print '{:.0%}|'.format(to),; to+=tell

if symbol.same: symbol._make([[n%symbol.bits]]+set[1:])

else: symbol._make(set)

coded.append(symbol())

symbol + (bit, train, limit)

base = set[0]

if len(base) == symbol.bits:

if symbol.blur: base = symbol.blur.resize(base)

set.insert(1, packbits(base).tolist())

set.pop(-1)

set[0] = [bit]

else: base.append(bit)

symbol._last = data

return dict(code=record(coded, by=data), error=record(abs(coded-data), by=data))