Python printing.Print方法代碼示例

# 需要導入模塊: from theano import printing [as 別名]
# 或者: from theano.printing import Print [as 別名]
def put_hook(variable, hook_fn, *args):
    r"""Put a hook on a Theano variables.

    Ensures that the hook function is executed every time when the value
    of the Theano variable is available.

    Parameters
    ----------
    variable : :class:`~tensor.TensorVariable`
        The variable to put a hook on.
    hook_fn : function
        The hook function. Should take a single argument: the variable's
        value.
    \*args : list
        Positional arguments to pass to the hook function.

    """
    return printing.Print(global_fn=lambda _, x: hook_fn(x, *args))(variable) 

# 需要導入模塊: from theano import printing [as 別名]
# 或者: from theano.printing import Print [as 別名]
def print_tensor(message, variable):
    """A small helper function that makes printing Theano variables a little bit
    easier.

    :type message: str
    :param message: message, typically the variable name

    :type variable: Variable
    :param variable: any tensor variable to be printed

    :rtype: Variable
    :returns: a tensor variable to be used further down the graph in place of
              ``variable``
    """

    print_op = printing.Print(message)
    return print_op(variable) 

# 需要導入模塊: from theano import printing [as 別名]
# 或者: from theano.printing import Print [as 別名]
def print_tensor(x, message=''):
    '''Print the message and the tensor when evaluated and return the same
    tensor.
    '''
    p_op = Print(message)
    return p_op(x)


# GRAPH MANIPULATION 

# 需要導入模塊: from theano import printing [as 別名]
# 或者: from theano.printing import Print [as 別名]
def print_tensor(x, message=''):
    """Print the message and the tensor when evaluated and return the same
    tensor.
    """
    p_op = Print(message)
    return p_op(x)


# GRAPH MANIPULATION 

# 需要導入模塊: from theano import printing [as 別名]
# 或者: from theano.printing import Print [as 別名]
def multivariate_normal_nohypers(datasets, weights, hyperparams, residuals):
    """
    Calculate posterior Likelihood of a Multivariate Normal distribution.
    Uses plain inverse of the covariances.
    DEPRECATED! Is currently not being used in beat.
    Can only be executed in a `with model context`.

    Parameters
    ----------
    datasets : list
        of :class:`heart.SeismicDataset` or :class:`heart.GeodeticDataset`
    weights : list
        of :class:`theano.shared`
        Square matrix of the inverse of the covariance matrix as weights
    hyperparams : dict
        of :class:`theano.`
    residual : list or array of model residuals

    Returns
    -------
    array_like
    """
    n_t = len(datasets)

    logpts = tt.zeros((n_t), 'float64')

    for l, data in enumerate(datasets):
        M = tt.cast(shared(
            data.samples, name='nsamples', borrow=True), 'int16')
        maha = residuals[l].dot(weights[l]).dot(residuals[l].T)
        slogpdet = Print('theano logpdet')(data.covariance.slog_pdet)
        logpts = tt.set_subtensor(
            logpts[l:l + 1],
            (-0.5) * (
                M * log_2pi + slogpdet + maha
                ))

    return logpts 

# 需要導入模塊: from theano import printing [as 別名]
# 或者: from theano.printing import Print [as 別名]
def assert_tensor_eq(result, name1, name2, variable1, variable2):
    """A small helper function that makes it a little bit easier to assert that
    two Theano variables are equal.

    :type result: Variable
    :param result: what the result of the operation should be

    :type name1: str
    :param name1: name of the first variable

    :type name2: str
    :param name2: name of the second variable

    :type variable1: Variable
    :param variable1: the first variable

    :type variable2: Variable
    :param variable2: the second variable

    :rtype: Variable
    :returns: a tensor variable that returns the same value as ``result``, and
              asserts that ``variable1`` equals to ``variable2``
    """

#    print_op = printing.Print(name1 + ":")
#    variable1 = tensor.switch(tensor.neq(variable1, variable2),
#                              print_op(variable1),
#                              variable1)
#    print_op = printing.Print(name2 + ":")
#    variable2 = tensor.switch(tensor.neq(variable1, variable2),
#                              print_op(variable2),
#                              variable2)
    assert_op = tensor.opt.Assert(name1 + " != " + name2)
    return assert_op(result, tensor.eq(variable1, variable2)) 

# 需要導入模塊: from theano import printing [as 別名]
# 或者: from theano.printing import Print [as 別名]
def arg_of_softmax(Y_hat):
    """
    Given the output of a call to theano.tensor.nnet.softmax,
    returns the argument to the softmax (by tracing the Theano
    graph).

    Parameters
    ----------
    Y_hat : Variable
        softmax(Z)

    Returns
    -------
    Z : Variable
        The variable that was passed to the Softmax op to create `Y_hat`.
        Raises an error if `Y_hat` is not actually the output of a
        Softmax.
    """
    assert hasattr(Y_hat, 'owner')
    owner = Y_hat.owner
    assert owner is not None
    op = owner.op
    if isinstance(op, Print):
        assert len(owner.inputs) == 1
        Y_hat, = owner.inputs
        owner = Y_hat.owner
        op = owner.op
    if not isinstance(op, T.nnet.Softmax):
        raise ValueError("Expected Y_hat to be the output of a softmax, "
                         "but it appears to be the output of " + str(op) +
                         " of type " + str(type(op)))
    z, = owner.inputs
    assert z.ndim == 2
    return z 

# 需要導入模塊: from theano import printing [as 別名]
# 或者: from theano.printing import Print [as 別名]
def arg_of_sigmoid(Y_hat):
    """
    Given the output of a call to theano.tensor.nnet.sigmoid,
    returns the argument to the sigmoid (by tracing the Theano
    graph).

    Parameters
    ----------
    Y_hat : Variable
        T.nnet.sigmoid(Z)

    Returns
    -------
    Z : Variable
        The variable that was passed to T.nnet.sigmoid to create `Y_hat`.
        Raises an error if `Y_hat` is not actually the output of a theano
        sigmoid.
    """
    assert hasattr(Y_hat, 'owner')
    owner = Y_hat.owner
    assert owner is not None
    op = owner.op
    if isinstance(op, Print):
        assert len(owner.inputs) == 1
        Y_hat, = owner.inputs
        owner = Y_hat.owner
        op = owner.op
    success = False
    if isinstance(op, T.Elemwise):
        if isinstance(op.scalar_op, T.nnet.sigm.ScalarSigmoid):
            success = True
    if not success:
        raise TypeError("Expected Y_hat to be the output of a sigmoid, "
                        "but it appears to be the output of " + str(op) +
                        " of type " + str(type(op)))
    z, = owner.inputs
    assert z.ndim == 2
    return z 

# 需要導入模塊: from theano import printing [as 別名]
# 或者: from theano.printing import Print [as 別名]
def printing(x, string=''):
    """Prints the value of a tensor variable
    :param x: Tensor variable
    :param string: Prefix to print
    :return: The same tensor variable as x
    """
    return theano.printing.Print(string)(x) 

# 需要導入模塊: from theano import printing [as 別名]
# 或者: from theano.printing import Print [as 別名]
def recons_cost(self, Y, Y_hat_unmasked, drop_mask_Y, scale):
        """
        The cost of reconstructing `Y` as `Y_hat`. Specifically,
        the negative log probability.

        This cost is for use with multi-prediction training.

        Parameters
        ----------
        Y : target space batch
            The data labels
        Y_hat_unmasked : target space batch
            The output of this layer's `mf_update`; the predicted
            values of `Y`. Even though the model is only predicting
            the dropped values, we take predictions for all the
            values here.
        drop_mask_Y : 1-D theano tensor
            A batch of 0s/1s, with 1s indicating that variables
            have been dropped, and should be included in the
            reconstruction cost. One indicator per example in the
            batch, since each example in this layer only has one
            random variable in it.
        scale : float
            Multiply the cost by this amount.
            We need to do this because the visible layer also goes into
            the cost. We use the mean over units and examples, so that
            the scale of the cost doesn't change too much with batch
            size or example size.
            We need to multiply this cost by scale to make sure that
            it is put on the same scale as the reconstruction cost
            for the visible units. ie, scale should be 1/nvis
        """


        Y_hat = Y_hat_unmasked
        assert hasattr(Y_hat, 'owner')
        owner = Y_hat.owner
        assert owner is not None
        op = owner.op
        if isinstance(op, Print):
            assert len(owner.inputs) == 1
            Y_hat, = owner.inputs
            owner = Y_hat.owner
            op = owner.op
        assert isinstance(op, T.nnet.Softmax)
        z ,= owner.inputs
        assert z.ndim == 2

        z = z - z.max(axis=1).dimshuffle(0, 'x')
        log_prob = z - T.log(T.exp(z).sum(axis=1).dimshuffle(0, 'x'))
        # we use sum and not mean because this is really one variable per row
        log_prob_of = (Y * log_prob).sum(axis=1)
        masked = log_prob_of * drop_mask_Y
        assert masked.ndim == 1

        rval = masked.mean() * scale * self.copies

        return - rval