Python numpy.copyto函数代码示例

def guess_data_type(orig_values, namask=None):
    """
    Use heuristics to guess data type.
    """
    valuemap, values = None, orig_values
    is_discrete = is_discrete_values(orig_values)
    if is_discrete:
        valuemap = sorted(is_discrete)
        coltype = DiscreteVariable
    else:
        # try to parse as float
        orig_values = np.asarray(orig_values)
        if namask is None:
            namask = isnastr(orig_values)
        values = np.empty_like(orig_values, dtype=float)
        values[namask] = np.nan
        try:
            np.copyto(values, orig_values, where=~namask, casting="unsafe")
        except ValueError:
            tvar = TimeVariable('_')
            try:
                values[~namask] = [tvar.parse(i) for i in orig_values[~namask]]
            except ValueError:
                coltype = StringVariable
                # return original_values
                values = orig_values
            else:
                coltype = TimeVariable
        else:
            coltype = ContinuousVariable
    return valuemap, values, coltype

 def testTensorAccessor(self):
   """Check that tensor returns a reference."""
   array_ref = self.interpreter.tensor(self.input0)
   np.copyto(array_ref(), self.initial_data)
   self.assertAllEqual(array_ref(), self.initial_data)
   self.assertAllEqual(
       self.interpreter.get_tensor(self.input0), self.initial_data)

def _copyto(a, val, mask):
    """
    Replace values in `a` with NaN where `mask` is True.  This differs from
    copyto in that it will deal with the case where `a` is a numpy scalar.

    Parameters
    ----------
    a : ndarray or numpy scalar
        Array or numpy scalar some of whose values are to be replaced
        by val.
    val : numpy scalar
        Value used a replacement.
    mask : ndarray, scalar
        Boolean array. Where True the corresponding element of `a` is
        replaced by `val`. Broadcasts.

    Returns
    -------
    res : ndarray, scalar
        Array with elements replaced or scalar `val`.

    """
    if isinstance(a, np.ndarray):
        np.copyto(a, val, where=mask, casting='unsafe')
    else:
        a = a.dtype.type(val)
    return a

def npArrayToReadOnlySharedArray(npArray):
    '''Returns a shared memory array for a numpy array.  Used to reduce memory footprint when passing parameters to multiprocess pools'''
    SharedBase = multiprocessing.sharedctypes.RawArray(ctypes.c_float, npArray.shape[0] * npArray.shape[1])
    SharedArray = np.ctypeslib.as_array(SharedBase)
    SharedArray = SharedArray.reshape(npArray.shape)
    np.copyto(SharedArray, npArray)
    return SharedArray

    def __call__(self, key, value):
        key = self.path + key.lstrip('/')
        if not self.strict and key not in self.npz:
            return value

        if isinstance(self.ignore_names, (tuple, list)):
            ignore_names = self.ignore_names
        else:
            ignore_names = (self.ignore_names,)
        for ignore_name in ignore_names:
            if isinstance(ignore_name, str):
                if key == ignore_name:
                    return value
            elif callable(ignore_name):
                if ignore_name(key):
                    return value
            else:
                raise ValueError(
                    'ignore_names needs to be a callable, string or '
                    'list of them.')

        dataset = self.npz[key]
        if dataset[()] is None:
            return None

        if value is None:
            return dataset
        elif isinstance(value, numpy.ndarray):
            numpy.copyto(value, dataset)
        elif isinstance(value, cuda.ndarray):
            value.set(numpy.asarray(dataset))
        else:
            value = type(value)(numpy.asarray(dataset))
        return value

def learn_parameters(adj_list, q, c_max, nb_iterations, crit_infer = 0.2, crit_learn = 0.2, tmax_infer = 12, tmax_learn = 8):
	"""
	Learns the true group parameters of a given graph, and returns the optimal group assignment given by the belief
	propagation algorithm
	"""
	# Number of nodes on the graph
	N = len(adj_list)

	# Optimal values given by the algorithm
	f_min = 0
	groups_opt = np.zeros(N, dtype = np.int8)
	for _ in range(nb_iterations):
		# Random initialization of each group's size
		n = np.random.rand(q)
		n /= np.sum(n)
		
		# Random initialization of the edge matrix
		c = np.random.rand(q, q)
		for i in range(q - 1):
			for j in range(i + 1, q):
				c[j, i] = c[i, j]
		c *= c_max

		# Application of the BP_learning algorithm for these initialized values
		groups, f_BP = BP_learning(q, n, c, adj_list, crit_infer, crit_learn, tmax_infer, tmax_learn)

		# Updates the optimal values found
		if f_BP < f_min:
			f_min = f_BP
			np.copyto(groups_opt, groups)

	# Returns the optimal group assignment found
	return groups_opt

def binary_to_net(weights, spm_stream, ind_stream, codebook, num_nz):
    bits = np.log2(codebook.size)
    if bits == 4:
        slots = 2
    elif bits == 8:
        slots = 1
    else:
        print "Not impemented,", bits
        sys.exit()
    code = np.zeros(weights.size, np.uint8) 

    # Recover from binary stream
    spm = np.zeros(num_nz, np.uint8)
    ind = np.zeros(num_nz, np.uint8)
    if slots == 2:
        spm[np.arange(0, num_nz, 2)] = spm_stream % (2**4)
        spm[np.arange(1, num_nz, 2)] = spm_stream / (2**4)
    else:
        spm = spm_stream
    ind[np.arange(0, num_nz, 2)] = ind_stream% (2**4)
    ind[np.arange(1, num_nz, 2)] = ind_stream/ (2**4)


    # Recover the matrix
    ind = np.cumsum(ind+1)-1
    code[ind] = spm
    data = np.reshape(codebook[code], weights.shape)
    np.copyto(weights, data)

 def apply_qt_elements_filtering(image):
     #
     # apply bilateral filter on IMAGE to smooth colors while keeping edges
     cv2.bilateralFilter(UtilityOperations.crop_to_720p(image), 3, 255, 50,
                         dst=MultiprocessOperations.shared_memory_image)
     #
     # crop elements from IMAGE
     MultiprocessOperations.wait_for_element_cropping()
     #
     # upload RED channels to GPU
     TheanoOperations.__shared_red.set_value(
         MultiprocessOperations.shared_memory_red_channel, borrow=True)
     #
     # upload GREEN channels to GPU
     TheanoOperations.__shared_green.set_value(
         MultiprocessOperations.shared_memory_green_channel, borrow=True)
     #
     # upload BLUE channels to GPU
     TheanoOperations.__shared_blue.set_value(
         MultiprocessOperations.shared_memory_blue_channel, borrow=True)
     #
     # download FILTERING result from GPU
     np.copyto(MultiprocessOperations.shared_memory_qt_filtered_elements,
               TheanoOperations.__apply_binary_filtering)
     #
     # apply IMAGE threshold CLASSIFICATION
     MultiprocessOperations.wait_for_qt_image_classification()
     return MultiprocessOperations.shared_memory_qt_filtered_elements

    def set_rho(self, rho):
        """
        Set the initial density matrix
        :param rho: 2D numpy array or sting containing the density matrix
        :return: self
        """
        if isinstance(rho, str):
            # density matrix is supplied as a string
            ne.evaluate("%s + 0j" % rho, local_dict=vars(self), out=self.rho)

        elif isinstance(rho, np.ndarray):
            # density matrix is supplied as an array

            # perform the consistency checks
            assert rho.shape == self.rho.shape,\
                "The grid size does not match with the density matrix"

            # make sure the density matrix is stored as a complex array
            np.copyto(self.rho, rho.astype(np.complex))

        else:
            raise ValueError("density matrix must be either string or numpy.array")

        # normalize
        self.rho /= self.rho.trace() * self.dX

        return self

 def _load_flat_grad(self, flat_grad):
   start = 0
   for g in self._grad_buffers:
     size = g.size
     np.copyto(g, np.reshape(flat_grad[start:start + size], g.shape))
     start += size
   return

    def serialize(self, serializer):
        """Serializes the link object.

        Args:
            serializer (~chainer.AbstractSerializer): Serializer object.

        """
        d = self.__dict__
        for name in self._params:
            serializer(name, d[name].data)
        for name in self._persistent:
            d[name] = serializer(name, d[name])
        if (self.has_uninitialized_params and
                isinstance(serializer, chainer.serializer.Serializer)):
            raise ValueError("uninitialized parameters cannot be serialized")
        for name in self._uninitialized_params.copy():
            # Note: There should only be uninitialized parameters
            # during deserialization.
            initialized_value = serializer(name, None)
            self.add_param(name, initialized_value.shape)
            uninitialized_value = d[name].data
            if isinstance(uninitialized_value, numpy.ndarray):
                numpy.copyto(uninitialized_value, initialized_value)
            elif isinstance(uninitialized_value, cuda.ndarray):
                uninitialized_value.set(numpy.asarray(initialized_value))

    def use(self, dataset):
        """
        Computes and returns the outputs of the Learner for
        ``dataset``:
        - the outputs should be a Numpy 2D array of size
          len(dataset) by (nb of classes + 1)
        - the ith row of the array contains the outputs for the ith example
        - the outputs for each example should contain
          the predicted class (first element) and the
          output probabilities for each class (following elements)
        Argument ``dataset`` is an MLProblem object.
        """

        outputs = np.zeros((len(dataset), self.n_classes + 1))
        errors = np.zeros((len(dataset), 2))

        ## PUT CODE HERE ##
        # row[0] is input.csv image (array), row[1] actual target class for that image
        for ind, row in enumerate(dataset):
            # fill 2nd element with loss
            errors[ind, 1] = self.fprop(row[0], row[1])
            # predicted class
            outputs[ind, 0] = np.argmax(self.hs[-1])
            # 0/1 classification error
            errors[ind, 0] = (outputs[ind, 0] != row[1])
            #             print "errors: ", errors[ind, ]
            # add output probs
            np.copyto(outputs[ind, 1:], self.hs[-1])
        #             print "outputs: ", outputs[ind,]
        #             time.sleep(5)

        return outputs, errors

def lieberfit(Data,Order=5):


	import numpy as np


	NewCurve = np.zeros(shape=(Data.shape[0]))
	OldCurve = np.array(Data)
	Diff = NewCurve-OldCurve
	Convergence = np.dot(Diff,Diff)


	m = 0
	while Convergence > 1: # Suggest setting convergence criteria == pixel resolution
		P = np.polyfit(range(len(Data)),OldCurve,Order)
		NewCurve = np.polyval(P,range(len(Data)))
		np.copyto(OldCurve, NewCurve, where = NewCurve < OldCurve)
		m+=1
		Diff = NewCurve - OldCurve
		Convergence = np.dot(Diff,Diff)
	#print('Iterations needed for convergence: ',m,sep='')


	CurveFit=np.copy(NewCurve)


	return (CurveFit)

    def revert_all(self, clear=False):
        '''return the image to it's original state'''
        np.copyto(self.image, self.ref_image)

        if clear:
            self.clear_history()
            self.drawing.reset()

def draw_bounding_box_on_image_array(image,
                                     ymin,
                                     xmin,
                                     ymax,
                                     xmax,
                                     color='red',
                                     thickness=4,
                                     display_str_list=(),
                                     use_normalized_coordinates=True):
  """Adds a bounding box to an image (numpy array).

  Bounding box coordinates can be specified in either absolute (pixel) or
  normalized coordinates by setting the use_normalized_coordinates argument.

  Args:
    image: a numpy array with shape [height, width, 3].
    ymin: ymin of bounding box.
    xmin: xmin of bounding box.
    ymax: ymax of bounding box.
    xmax: xmax of bounding box.
    color: color to draw bounding box. Default is red.
    thickness: line thickness. Default value is 4.
    display_str_list: list of strings to display in box
                      (each to be shown on its own line).
    use_normalized_coordinates: If True (default), treat coordinates
      ymin, xmin, ymax, xmax as relative to the image.  Otherwise treat
      coordinates as absolute.
  """
  image_pil = Image.fromarray(np.uint8(image)).convert('RGB')
  draw_bounding_box_on_image(image_pil, ymin, xmin, ymax, xmax, color,
                             thickness, display_str_list,
                             use_normalized_coordinates)
  np.copyto(image, np.array(image_pil))