class CioEncoder(LanguageEncoder):
"""
A language encoder using the Cortical.io API.
The encoder queries the Cortical.io REST API via the cortipy module, which
returns data in the form of "fingerprints". These representations are
converted to binary SDR arrays with this Cio encoder.
"""
def __init__(self,
retina=DEFAULT_RETINA,
retinaScaling=1.0,
cacheDir=None,
verbosity=0,
fingerprintType=EncoderTypes.document,
unionSparsity=0.20,
apiKey=None,
maxSparsity=0.50):
"""
@param retina (str) Cortical.io retina, either "en_synonymous"
or "en_associative".
@param retinaScaling (float) Scale each dimension of the SDR bitmap
by this factor.
@param cacheDir (str) Where to cache results of API queries.
@param verbosity (int) Amount of info printed out, 0, 1, or 2.
@param fingerprintType (Enum) Specify word- or document-level encoding.
@param unionSparsity (float) Any union'ing done in this encoder will
stop once this sparsity is reached.
@param maxSparsity (float) The maximum sparsity of the returned
bitmap. If the percentage of bits in the
encoding is > maxSparsity, it will be
randomly subsampled.
TODO: replace enum with a simple string
"""
if apiKey is None and "CORTICAL_API_KEY" not in os.environ:
print(
"Missing CORTICAL_API_KEY environment variable. If you have a "
"key, set it with $ export CORTICAL_API_KEY=api_key\n"
"You can retrieve a key by registering for the REST API at "
"http://www.cortical.io/resources_apikey.html")
raise OSError("Missing API key.")
super(CioEncoder, self).__init__(unionSparsity=unionSparsity)
if cacheDir is None:
root = os.path.dirname(os.path.realpath(__file__))
cacheDir = os.path.join(root, "CioCache")
self.apiKey = apiKey if apiKey else os.environ["CORTICAL_API_KEY"]
self.client = CorticalClient(self.apiKey,
retina=retina,
cacheDir=cacheDir)
self._setDimensions(retina, retinaScaling)
self.fingerprintType = fingerprintType
self.description = ("Cio Encoder", 0)
self.verbosity = verbosity
self.maxSparsity = maxSparsity
def _setDimensions(self, retina, scalingFactor):
if scalingFactor <= 0 or scalingFactor > 1:
raise ValueError(
"Retina can only be scaled by values between 0 and 1.")
retinaDim = RETINA_SIZES[retina]["width"]
self.width = int(retinaDim * scalingFactor)
self.height = int(retinaDim * scalingFactor)
self.retinaScaling = float(self.width) / retinaDim
self.n = self.width * self.height
def encode(self, text):
"""
Encodes the input text w/ a cortipy client. The client returns a
dictionary of "fingerprint" info, including the SDR bitmap as a numpy.array.
NOTE: returning this fingerprint dict differs from the base class spec.
@param text (str) A non-tokenized sample of text.
@return (dict) Result from the cortipy client. The bitmap
encoding is at
encoding["fingerprint"]["positions"].
"""
if not isinstance(text, str) and not isinstance(text, unicode):
raise TypeError(
"Expected a string input but got input of type {}.".format(
type(text)))
try:
if self.fingerprintType == EncoderTypes.document:
encoding = self.client.getTextBitmap(text)
elif self.fingerprintType == EncoderTypes.word:
encoding = self.getUnionEncoding(text)
else:
encoding = self.client.getBitmap(text)
except UnsuccessfulEncodingError:
if self.verbosity > 0:
print(
"\tThe client returned no encoding for the text \'{0}\', so "
"we'll use the encoding of the token that is least frequent in "
"the corpus.".format(text))
encoding = self._subEncoding(text)
return self.finishEncoding(encoding)
def getUnionEncoding(self, text):
"""
Encode each token of the input text, take the union, and then sparsify.
@param text (str) A non-tokenized sample of text.
@return (dict) The bitmap encoding is at
encoding["fingerprint"]["positions"].
"""
tokens = TextPreprocess().tokenize(text)
# Count the ON bits represented in the encoded tokens.
counts = Counter()
for t in tokens:
bitmap = self._getWordBitmap(t)
counts.update(bitmap)
positions = self.sparseUnion(counts)
# Populate encoding
encoding = {
"text": text,
"sparsity": len(positions) / float(self.n),
"df": 0.0,
"height": self.height,
"width": self.width,
"score": 0.0,
"fingerprint": {
"positions": sorted(positions)
},
"pos_types": []
}
return encoding
def getWindowEncoding(self, tokens, minSparsity=0.0):
"""
The encodings simulate a "sliding window", where the encoding representation
of a given token is a union of its bitmap with the immediately previous
tokens' bitmaps, up to the maximum sparsity. The returned list only includes
those windows with sparsities larger than the minimum.
@param tokens (list) Tokenized string.
@param minSparsity (float) Only window encodings denser than this value
will be included.
@return windowBitmaps (list) Dict for each token, with entries for the
token string, sparsity float, and bitmap
numpy array.
"""
if self.fingerprintType != EncoderTypes.word:
print("Although the encoder type is not set for words, the window "
"encodings use word-level fingerprints.")
bitmaps = [numpy.array(self._getWordBitmap(t)) for t in tokens]
windowBitmaps = []
for tokenIndex, windowBitmap in enumerate(bitmaps):
# Each index in the tokens list is the end of a possible window.
for i in reversed(xrange(tokenIndex)):
# From the current token, increase the window by successively adding the
# previous tokens.
windowSparsity = len(windowBitmap) / float(self.n)
nextSparsity = len(bitmaps[i]) / float(self.n)
if windowSparsity + nextSparsity > self.unionSparsity:
# stopping criterion reached -- window is full
break
else:
# add bitmap to the current window bitmap
windowBitmap = numpy.union1d(windowBitmap, bitmaps[i])
sparsity = len(windowBitmap) / float(self.n)
if sparsity > minSparsity:
# only include windows of sufficient density
windowBitmaps.append({
"text": tokens[i:tokenIndex + 1],
"sparsity": sparsity,
"bitmap": numpy.array(windowBitmap)
})
return windowBitmaps
def finishEncoding(self, encoding):
"""
Scale the fingerprint of the encoding dict (if specified) and fill the
width, height, and sparsity fields.
@param encoding (dict) Dict as returned by the Cio client.
@return encoding (dict) Same format as the input dict, with the
dimensions and sparsity fields populated.
"""
if self.retinaScaling != 1:
encoding["fingerprint"]["positions"] = self.scaleEncoding(
encoding["fingerprint"]["positions"], self.retinaScaling**2)
encoding["width"] = self.width
encoding["height"] = self.height
encoding["fingerprint"]["positions"] = numpy.array(
encoding["fingerprint"]["positions"])
encoding["sparsity"] = len(
encoding["fingerprint"]["positions"]) / float(
(encoding["width"] * encoding["height"]))
# Reduce sparsity if needed
if encoding["sparsity"] > self.maxSparsity:
self.reduceSparsity(encoding, self.maxSparsity)
return encoding
def _getWordBitmap(self, term):
"""
Return a bitmap for the word. If the Cortical.io API can't encode, cortipy
will use a random encoding for the word.
"""
return self.client.getBitmap(term)["fingerprint"]["positions"]
def encodeIntoArray(self, inputText, output):
"""
Encodes inputText and puts the encoded value into the numpy output array,
which is a 1-D array of length returned by getWidth().
"""
encoding = self.encode(inputText)
output[:] = 0
if encoding["fingerprint"]["positions"].size > 0:
output[encoding["fingerprint"]["positions"]] = 1
def decode(self, encoding, numTerms=10):
"""
Converts an SDR back into the most likely word or words.
By default, the most likely term will be returned. If numTerms is
specified, then the Cortical.io API will attempt to return that many;
otherwise the standard is 10. The return value will be a sequence of
(term, weight) tuples, where higher weights imply the corresponding term
better matches the encoding.
@param encoding (list) Bitmap encoding.
@param numTerms (int) The max number of terms to return.
@return (list) List of dictionaries, where keys
are terms and likelihood scores.
"""
terms = self.client.bitmapToTerms(encoding, numTerms=numTerms)
# Convert cortipy response to list of tuples (term, weight)
return [(term["term"], term["score"]) for term in terms]
def _subEncoding(self, text, method="keyword"):
"""
@param text (str) A non-tokenized sample of text.
@return encoding (dict) Fingerprint from cortipy client.
An empty dictionary of the text
could not be encoded.
"""
try:
if method == "df":
tokens = list(
itertools.chain.from_iterable(
[t.split(",") for t in self.client.tokenize(text)]))
encoding = min([self.client.getBitmap(t) for t in tokens],
key=lambda x: x["df"])
elif method == "keyword":
encoding = self.getUnionEncoding(text)
else:
raise ValueError("method must be either 'df' or 'keyword'")
except UnsuccessfulEncodingError:
if self.verbosity > 0:
print(
"\tThe client returned no substitute encoding for the text "
"'{}', so we encode with None.".format(text))
encoding = None
return encoding
def compare(self, bitmap1, bitmap2):
"""
Compare encodings, returning the distances between the SDRs. Input bitmaps
must be list objects (need to be serializable).
Example return dict:
{
"cosineSimilarity": 0.6666666666666666,
"euclideanDistance": 0.3333333333333333,
"jaccardDistance": 0.5,
"overlappingAll": 6,
"overlappingLeftRight": 0.6666666666666666,
"overlappingRightLeft": 0.6666666666666666,
"sizeLeft": 9,
"sizeRight": 9,
"weightedScoring": 0.4436476984102028
}
"""
if not isinstance(bitmap1 and bitmap2, list):
raise TypeError("Comparison bitmaps must be lists.")
return self.client.compare(bitmap1, bitmap2)
def createCategory(self, label, positives, negatives=None):
"""
Create a classification category (bitmap) via the Cio claassify endpoint.
@param label (str) Name of category.
@param positives (list) Bitmap(s) of samples to define.
@param negatives (list) Not required to make category.
@return (dict) Key-values for "positions" (list bitmap encoding
of the category and "categoryName" (str).
"""
if negatives is None:
negatives = []
if not isinstance(positives and negatives, list):
raise TypeError("Input bitmaps must be lists.")
return self.client.createClassification(label, positives, negatives)
def getWidth(self):
return self.n
def getDimensions(self):
return (self.width, self.height)
def getDescription(self):
return self.description
def densifyPattern(self, bitmap):
"""Return a numpy array of 0s and 1s to represent the given bitmap."""
sparsePattern = numpy.zeros(self.n)
for i in bitmap:
sparsePattern[i] = 1.0
return sparsePattern
def reduceSparsity(self, encoding, maxSparsity):
"""Reduce the sparsity of the encoding down to maxSparsity"""
desiredBits = maxSparsity * encoding["width"] * encoding["height"]
bitmap = encoding["fingerprint"]["positions"]
# Choose a random subsampling of the bits but seed the random number
# generator so we get consistent bitmaps
numpy.random.seed(bitmap.sum())
encoding["fingerprint"]["positions"] = (
numpy.random.permutation(bitmap)[0:desiredBits])
encoding["sparsity"] = len(
encoding["fingerprint"]["positions"]) / float(
(encoding["width"] * encoding["height"]))
class CioEncoder(LanguageEncoder):
"""
A language encoder using the Cortical.io API.
The encoder queries the Cortical.io REST API via the cortipy module, which
returns data in the form of "fingerprints". These representations are
converted to binary SDR arrays with this Cio encoder.
"""
def __init__(self,
w=128,
h=128,
retina=DEFAULT_RETINA,
cacheDir="./cache",
verbosity=0,
fingerprintType=EncoderTypes.document):
"""
@param w (int) Width dimension of the SDR topology.
@param h (int) Height dimension of the SDR topology.
@param cacheDir (str) Where to cache results of API queries.
@param verbosity (int) Amount of info printed out, 0, 1, or 2.
@param fingerprintType (Enum) Specify word- or document-level encoding.
"""
if "CORTICAL_API_KEY" not in os.environ:
print(
"Missing CORTICAL_API_KEY environment variable. If you have a "
"key, set it with $ export CORTICAL_API_KEY=api_key\n"
"You can retrieve a key by registering for the REST API at "
"http://www.cortical.io/resources_apikey.html")
raise OSError("Missing API key.")
self.apiKey = os.environ["CORTICAL_API_KEY"]
self.client = CorticalClient(self.apiKey,
retina=retina,
cacheDir=cacheDir)
self.targetSparsity = 5.0
self.w = w
self.h = h
self.n = w * h
self.verbosity = verbosity
self.fingerprintType = fingerprintType
self.description = ("Cio Encoder", 0)
def encode(self, text):
"""
Encodes the input text w/ a cortipy client. The client returns a
dictionary of "fingerprint" info, including the SDR bitmap.
NOTE: returning this fingerprint dict differs from the base class spec.
@param text (str) A non-tokenized sample of text.
@return (dict) Result from the cortipy client. The bitmap
encoding is at
encoding["fingerprint"]["positions"].
"""
if not text:
return None
try:
if self.fingerprintType is EncoderTypes.document:
encoding = self.client.getTextBitmap(text)
elif self.fingerprintType is EncoderTypes.word:
encoding = self.getUnionEncoding(text)
except UnsuccessfulEncodingError:
if self.verbosity > 0:
print(
"\tThe client returned no encoding for the text \'{0}\', so "
"we'll use the encoding of the token that is least frequent in "
"the corpus.".format(text))
encoding = self._subEncoding(text)
return encoding
def getUnionEncoding(self, text):
"""
Encode each token of the input text, take the union, and then sparsify.
@param text (str) A non-tokenized sample of text.
@return (dict) The bitmap encoding is at
encoding["fingerprint"]["positions"].
"""
tokens = TextPreprocess().tokenize(text)
# Count the ON bits represented in the encoded tokens.
counts = Counter()
for t in tokens:
bitmap = self.client.getBitmap(t)["fingerprint"]["positions"]
counts.update(bitmap)
positions = self.sparseUnion(counts)
# Populate encoding
encoding = {
"text": text,
"sparsity": len(positions) * 100 / float(self.n),
"df": 0.0,
"height": self.h,
"width": self.w,
"score": 0.0,
"fingerprint": {
"positions": sorted(positions)
},
"pos_types": []
}
return encoding
def encodeIntoArray(self, inputText, output):
"""
See method description in language_encoder.py. It is expected the inputText
is a single word/token (str).
NOTE: nupic Encoder class method encodes output in place as sparse array
(commented out below), but this method returns a bitmap.
"""
if not isinstance(inputText, str):
raise TypeError(
"Expected a string input but got input of type {}.".format(
type(inputText)))
# Encode with term endpoint of Cio API
try:
encoding = self.client.getBitmap(inputText)
except UnsuccessfulEncodingError:
if self.verbosity > 0:
print(
"\tThe client returned no encoding for the text \'{0}\', so "
"we'll use the encoding of the token that is least frequent in "
"the corpus.".format(inputText))
encoding = self._subEncoding(inputText)
# output = sparsify(encoding["fingerprint"]["positions"])
return encoding
def decode(self, encoding, numTerms=10):
"""
Converts an SDR back into the most likely word or words.
By default, the most likely term will be returned. If numTerms is
specified, then the Cortical.io API will attempt to return that many;
otherwise the standard is 10. The return value will be a sequence of
(term, weight) tuples, where higher weights imply the corresponding term
better matches the encoding.
@param encoding (list) Bitmap encoding.
@param numTerms (int) The max number of terms to return.
@return (list) List of dictionaries, where keys
are terms and likelihood scores.
"""
terms = self.client.bitmapToTerms(encoding, numTerms=numTerms)
# Convert cortipy response to list of tuples (term, weight)
return [((term["term"], term["score"])) for term in terms]
def _subEncoding(self, text, method="keyword"):
"""
@param text (str) A non-tokenized sample of text.
@return encoding (dict) Fingerprint from cortipy client.
An empty dictionary of the text
could not be encoded.
"""
tokens = list(
itertools.chain.from_iterable(
[t.split(',') for t in self.client.tokenize(text)]))
try:
if method == "df":
encoding = min([self.client.getBitmap(t) for t in tokens],
key=lambda x: x["df"])
elif method == "keyword":
encoding = self.getUnionEncoding(text)
else:
raise ValueError("method must be either \'df\' or \'keyword\'")
except UnsuccessfulEncodingError:
if self.verbosity > 0:
print(
"\tThe client returned no substitute encoding for the text "
"\'{0}\', so we encode with None.".format(text))
encoding = None
return encoding
def compare(self, bitmap1, bitmap2):
"""
Compare encodings, returning the distances between the SDRs. Input bitmaps
must be list objects (need to be serializable).
Example return dict:
{
"cosineSimilarity": 0.6666666666666666,
"euclideanDistance": 0.3333333333333333,
"jaccardDistance": 0.5,
"overlappingAll": 6,
"overlappingLeftRight": 0.6666666666666666,
"overlappingRightLeft": 0.6666666666666666,
"sizeLeft": 9,
"sizeRight": 9,
"weightedScoring": 0.4436476984102028
}
"""
if not isinstance(bitmap1 and bitmap2, list):
raise TypeError("Comparison bitmaps must be lists.")
return self.client.compare(bitmap1, bitmap2)
def createCategory(self, label, positives, negatives=None):
"""
Create a classification category (bitmap) via the Cio claassify endpoint.
@param label (str) Name of category.
@param positives (list) Bitmap(s) of samples to define.
@param negatives (list) Not required to make category.
@return (dict) Key-values for "positions" (list bitmap encoding
of the category and "categoryName" (str).
"""
if negatives is None:
negatives = []
if not isinstance(positives and negatives, list):
raise TypeError("Input bitmaps must be lists.")
return self.client.createClassification(label, positives, negatives)
def getWidth(self):
return self.n
def getDescription(self):
return self.description
class CioEncoder(LanguageEncoder):
"""
A language encoder using the Cortical.io API.
The encoder queries the Cortical.io REST API via the cortipy module, which
returns data in the form of "fingerprints". These representations are
converted to binary SDR arrays with this Cio encoder.
"""
def __init__(self, retina=DEFAULT_RETINA, retinaScaling=1.0, cacheDir=None,
verbosity=0, fingerprintType=EncoderTypes.document,
unionSparsity=0.20, apiKey=None,
maxSparsity=0.50):
"""
@param retina (str) Cortical.io retina, either "en_synonymous"
or "en_associative".
@param retinaScaling (float) Scale each dimension of the SDR bitmap
by this factor.
@param cacheDir (str) Where to cache results of API queries.
@param verbosity (int) Amount of info printed out, 0, 1, or 2.
@param fingerprintType (Enum) Specify word- or document-level encoding.
@param unionSparsity (float) Any union'ing done in this encoder will
stop once this sparsity is reached.
@param maxSparsity (float) The maximum sparsity of the returned
bitmap. If the percentage of bits in the
encoding is > maxSparsity, it will be
randomly subsampled.
TODO: replace enum with a simple string
"""
if apiKey is None and "CORTICAL_API_KEY" not in os.environ:
print ("Missing CORTICAL_API_KEY environment variable. If you have a "
"key, set it with $ export CORTICAL_API_KEY=api_key\n"
"You can retrieve a key by registering for the REST API at "
"http://www.cortical.io/resources_apikey.html")
raise OSError("Missing API key.")
super(CioEncoder, self).__init__(unionSparsity=unionSparsity)
if cacheDir is None:
root = os.path.dirname(os.path.realpath(__file__))
cacheDir = os.path.join(root, "CioCache")
self.apiKey = apiKey if apiKey else os.environ["CORTICAL_API_KEY"]
self.client = CorticalClient(self.apiKey, retina=retina, cacheDir=cacheDir)
self._setDimensions(retina, retinaScaling)
self.fingerprintType = fingerprintType
self.description = ("Cio Encoder", 0)
self.verbosity = verbosity
self.maxSparsity = maxSparsity
def _setDimensions(self, retina, scalingFactor):
if scalingFactor <= 0 or scalingFactor > 1:
raise ValueError("Retina can only be scaled by values between 0 and 1.")
retinaDim = RETINA_SIZES[retina]["width"]
self.width = int(retinaDim * scalingFactor)
self.height = int(retinaDim * scalingFactor)
self.retinaScaling = float(self.width)/retinaDim
self.n = self.width * self.height
def encode(self, text):
"""
Encodes the input text w/ a cortipy client. The client returns a
dictionary of "fingerprint" info, including the SDR bitmap as a numpy.array.
NOTE: returning this fingerprint dict differs from the base class spec.
@param text (str) A non-tokenized sample of text.
@return (dict) Result from the cortipy client. The bitmap
encoding is at
encoding["fingerprint"]["positions"].
"""
if not isinstance(text, str) and not isinstance(text, unicode):
raise TypeError("Expected a string input but got input of type {}."
.format(type(text)))
try:
if self.fingerprintType == EncoderTypes.document:
encoding = self.client.getTextBitmap(text)
elif self.fingerprintType == EncoderTypes.word:
encoding = self.getUnionEncoding(text)
else:
encoding = self.client.getBitmap(text)
except UnsuccessfulEncodingError:
if self.verbosity > 0:
print ("\tThe client returned no encoding for the text \'{0}\', so "
"we'll use the encoding of the token that is least frequent in "
"the corpus.".format(text))
encoding = self._subEncoding(text)
return self.finishEncoding(encoding)
def getUnionEncoding(self, text):
"""
Encode each token of the input text, take the union, and then sparsify.
@param text (str) A non-tokenized sample of text.
@return (dict) The bitmap encoding is at
encoding["fingerprint"]["positions"].
"""
tokens = TextPreprocess().tokenize(text)
# Count the ON bits represented in the encoded tokens.
counts = Counter()
for t in tokens:
bitmap = self._getWordBitmap(t)
counts.update(bitmap)
positions = self.sparseUnion(counts)
# Populate encoding
encoding = {
"text": text,
"sparsity": len(positions) / float(self.n),
"df": 0.0,
"height": self.height,
"width": self.width,
"score": 0.0,
"fingerprint": {
"positions":sorted(positions)
},
"pos_types": []
}
return encoding
def getWindowEncoding(self, tokens, minSparsity=0.0):
"""
The encodings simulate a "sliding window", where the encoding representation
of a given token is a union of its bitmap with the immediately previous
tokens' bitmaps, up to the maximum sparsity. The returned list only includes
those windows with sparsities larger than the minimum.
@param tokens (list) Tokenized string.
@param minSparsity (float) Only window encodings denser than this value
will be included.
@return windowBitmaps (list) Dict for each token, with entries for the
token string, sparsity float, and bitmap
numpy array.
"""
if self.fingerprintType != EncoderTypes.word:
print ("Although the encoder type is not set for words, the window "
"encodings use word-level fingerprints.")
bitmaps = [numpy.array(self._getWordBitmap(t)) for t in tokens]
windowBitmaps = []
for tokenIndex, windowBitmap in enumerate(bitmaps):
# Each index in the tokens list is the end of a possible window.
for i in reversed(xrange(tokenIndex)):
# From the current token, increase the window by successively adding the
# previous tokens.
windowSparsity = len(windowBitmap) / float(self.n)
nextSparsity = len(bitmaps[i]) / float(self.n)
if windowSparsity + nextSparsity > self.unionSparsity:
# stopping criterion reached -- window is full
break
else:
# add bitmap to the current window bitmap
windowBitmap = numpy.union1d(windowBitmap, bitmaps[i])
sparsity = len(windowBitmap) / float(self.n)
if sparsity > minSparsity:
# only include windows of sufficient density
windowBitmaps.append(
{"text": tokens[i:tokenIndex+1],
"sparsity": sparsity,
"bitmap": numpy.array(windowBitmap)})
return windowBitmaps
def finishEncoding(self, encoding):
"""
Scale the fingerprint of the encoding dict (if specified) and fill the
width, height, and sparsity fields.
@param encoding (dict) Dict as returned by the Cio client.
@return encoding (dict) Same format as the input dict, with the
dimensions and sparsity fields populated.
"""
if self.retinaScaling != 1:
encoding["fingerprint"]["positions"] = self.scaleEncoding(
encoding["fingerprint"]["positions"], self.retinaScaling**2)
encoding["width"] = self.width
encoding["height"] = self.height
encoding["fingerprint"]["positions"] = numpy.array(
encoding["fingerprint"]["positions"])
encoding["sparsity"] = len(encoding["fingerprint"]["positions"]) / float(
(encoding["width"] * encoding["height"]))
# Reduce sparsity if needed
if encoding["sparsity"] > self.maxSparsity:
self.reduceSparsity(encoding, self.maxSparsity)
return encoding
def _getWordBitmap(self, term):
"""
Return a bitmap for the word. If the Cortical.io API can't encode, cortipy
will use a random encoding for the word.
"""
return self.client.getBitmap(term)["fingerprint"]["positions"]
def encodeIntoArray(self, inputText, output):
"""
Encodes inputText and puts the encoded value into the numpy output array,
which is a 1-D array of length returned by getWidth().
"""
encoding = self.encode(inputText)
output[:] = 0
if encoding["fingerprint"]["positions"].size > 0:
output[encoding["fingerprint"]["positions"]] = 1
def decode(self, encoding, numTerms=10):
"""
Converts an SDR back into the most likely word or words.
By default, the most likely term will be returned. If numTerms is
specified, then the Cortical.io API will attempt to return that many;
otherwise the standard is 10. The return value will be a sequence of
(term, weight) tuples, where higher weights imply the corresponding term
better matches the encoding.
@param encoding (list) Bitmap encoding.
@param numTerms (int) The max number of terms to return.
@return (list) List of dictionaries, where keys
are terms and likelihood scores.
"""
terms = self.client.bitmapToTerms(encoding, numTerms=numTerms)
# Convert cortipy response to list of tuples (term, weight)
return [(term["term"], term["score"]) for term in terms]
def _subEncoding(self, text, method="keyword"):
"""
@param text (str) A non-tokenized sample of text.
@return encoding (dict) Fingerprint from cortipy client.
An empty dictionary of the text
could not be encoded.
"""
try:
if method == "df":
tokens = list(itertools.chain.from_iterable(
[t.split(",") for t in self.client.tokenize(text)]))
encoding = min(
[self.client.getBitmap(t) for t in tokens], key=lambda x: x["df"])
elif method == "keyword":
encoding = self.getUnionEncoding(text)
else:
raise ValueError("method must be either 'df' or 'keyword'")
except UnsuccessfulEncodingError:
if self.verbosity > 0:
print ("\tThe client returned no substitute encoding for the text "
"'{}', so we encode with None.".format(text))
encoding = None
return encoding
def compare(self, bitmap1, bitmap2):
"""
Compare encodings, returning the distances between the SDRs. Input bitmaps
must be list objects (need to be serializable).
Example return dict:
{
"cosineSimilarity": 0.6666666666666666,
"euclideanDistance": 0.3333333333333333,
"jaccardDistance": 0.5,
"overlappingAll": 6,
"overlappingLeftRight": 0.6666666666666666,
"overlappingRightLeft": 0.6666666666666666,
"sizeLeft": 9,
"sizeRight": 9,
"weightedScoring": 0.4436476984102028
}
"""
if not isinstance(bitmap1 and bitmap2, list):
raise TypeError("Comparison bitmaps must be lists.")
return self.client.compare(bitmap1, bitmap2)
def createCategory(self, label, positives, negatives=None):
"""
Create a classification category (bitmap) via the Cio claassify endpoint.
@param label (str) Name of category.
@param positives (list) Bitmap(s) of samples to define.
@param negatives (list) Not required to make category.
@return (dict) Key-values for "positions" (list bitmap encoding
of the category and "categoryName" (str).
"""
if negatives is None:
negatives = []
if not isinstance(positives and negatives, list):
raise TypeError("Input bitmaps must be lists.")
return self.client.createClassification(label, positives, negatives)
def getWidth(self):
return self.n
def getDimensions(self):
return (self.width, self.height)
def getDescription(self):
return self.description
def densifyPattern(self, bitmap):
"""Return a numpy array of 0s and 1s to represent the given bitmap."""
sparsePattern = numpy.zeros(self.n)
for i in bitmap:
sparsePattern[i] = 1.0
return sparsePattern
def reduceSparsity(self, encoding, maxSparsity):
"""Reduce the sparsity of the encoding down to maxSparsity"""
desiredBits = maxSparsity*encoding["width"]*encoding["height"]
bitmap = encoding["fingerprint"]["positions"]
# Choose a random subsampling of the bits but seed the random number
# generator so we get consistent bitmaps
numpy.random.seed(bitmap.sum())
encoding["fingerprint"]["positions"] = (
numpy.random.permutation(bitmap)[0:desiredBits] )
encoding["sparsity"] = len(encoding["fingerprint"]["positions"]) / float(
(encoding["width"] * encoding["height"]))
