Python graph.inputs函数代码示例

 def test_not_destructive(self):
     # Checks that manipulating a cloned graph leaves the original unchanged.
     r1, r2, r5 = MyVariable(1), MyVariable(2), MyVariable(5)
     node = MyOp.make_node(MyOp.make_node(r1, r2).outputs[0], r5)
     _, new = clone([r1, r2, r5], node.outputs, False)
     new_node = new[0].owner
     new_node.inputs = MyVariable(7), MyVariable(8)
     assert self.str(inputs(new_node.outputs), new_node.outputs) == ["MyOp(R7, R8)"]
     assert self.str(inputs(node.outputs), node.outputs) == ["MyOp(MyOp(R1, R2), R5)"]

def check_parameter(name, value):
    parameters = set()
    constants = set()
    observeds = set()

    if isinstance(value, SharedVariable):
        parameters.add(value)
    elif isinstance(value, T.TensorConstant):
        constants.add(value)
    elif isinstance(value, T.TensorVariable):
        inputs = graph.inputs([value])

        for var in inputs:
            if isinstance(var, SharedVariable):
                parameters.add(var)
            elif isinstance(var, T.TensorConstant):
                constants.add(var)
            elif isinstance(var, T.TensorVariable):
                if not var.name:
                    raise ValueError("Observed variables must be named.")
                observeds.add(var)
    else:
        # XXX allow for lists and convert them to ndarray

        if isinstance(value, np.ndarray):
            value = theano.shared(value, name=name)
        else:
            value = theano.shared(float(value), name=name)

        parameters.add(value)

    return value, parameters, constants, observeds

def elemwise_logp(model, var):
    terms = filter(lambda term: var in inputs([term]), model.factors)

    p = function(model.vars, builtin_sum(terms))
    def fn(x):
        return p(**x)
    return fn

def predict():
    """
    An example of how to load a train model and use it
    to predict labels.
    """

     # load the saved model
    model_file = open('best_model_linear.pkl', 'rb')
    classifier = pickle.load(model_file)
    model_file.close()
    y_pred = classifier.y_pred

    # find the input to theano graph
    inputs = graph.inputs([y_pred])
    # select only x
    inputs = [item for item in inputs if item.name == 'x']

    # compile a predictor function
    predict_model = theano.function(
        inputs=inputs,
        outputs=y_pred)

    X_test = np.random.rand(1000,500)*.75 +.25
    X_test=  np.append(X_test, np.random.rand(1000,500)*.75,axis=0)

    y_test = np.random.rand(1000,)*.3
    y_test = np.append(y_test, np.random.rand(1000,)*.3+.7,axis=0)

    predicted_values = predict_model(X_test)
    print ("Predicted values for the first 10 examples in test set:")
    plt.hist(predicted_values)
    print (predicted_values)

def check_parameter(name, value):
    """Check, convert and extract inputs of a parameter value.

    This function wraps scalar or lists into a Theano shared variable, then
    acting as a parameter. Theano expressions are left unchanged.

    Parameters
    ----------
    * `name` [string]:
        The parameter name.

    * `value` [theano expression, list or scalar]:
        The parameter value.

    Returns
    -------
    * `value` [theano expression]:
        The parameter expression.

    * `parameters` [set of theano shared variables]:
        Set of base shared variables on which `value` depends.

    * `constants` [set of theano constants]:
        Set of base constants on which `value` depends.

    * `observeds` [set of theano tensor variables]:
        Set of base unset variables on which `value` depends.
    """
    parameters = set()
    constants = set()
    observeds = set()

    if isinstance(value, SharedVariable):
        parameters.add(value)
    elif isinstance(value, T.TensorConstant):
        constants.add(value)
    elif isinstance(value, T.TensorVariable):
        inputs = graph.inputs([value])

        for var in inputs:
            if isinstance(var, SharedVariable):
                parameters.add(var)
            elif isinstance(var, T.TensorConstant):
                constants.add(var)
            elif isinstance(var, T.TensorVariable):
                if not var.name:
                    raise ValueError("Observed variables must be named.")
                observeds.add(var)
    else:
        if isinstance(value, list):
            value = np.ndarray(value)

        if isinstance(value, np.ndarray):
            value = theano.shared(value, name=name)
        else:
            value = theano.shared(float(value), name=name)

        parameters.add(value)

    return value, parameters, constants, observeds

    def _get_variables(self):
        """Collect variables, updates and auxiliary variables.

        In addition collects all :class:`.Scan` ops and recurses in the
        respective inner Theano graphs.

        """
        updates = OrderedDict()

        shared_outputs = [o for o in self.outputs if is_shared_variable(o)]
        usual_outputs = [o for o in self.outputs if not is_shared_variable(o)]
        variables = shared_outputs

        if usual_outputs:
            # Sort apply nodes topologically, get variables and remove
            # duplicates
            inputs = graph.inputs(self.outputs)
            sorted_apply_nodes = graph.io_toposort(inputs, usual_outputs)
            self.scans = list(unique([node.op for node in sorted_apply_nodes
                                     if isinstance(node.op, Scan)],
                                     key=lambda op: id(op)))
            self._scan_graphs = [ComputationGraph(scan.outputs)
                                 for scan in self.scans]

            seen = set()
            main_vars = (
                [var for var in list(chain(
                    *[apply_node.inputs for apply_node in sorted_apply_nodes]))
                 if not (var in seen or seen.add(var))] +
                [var for var in self.outputs if var not in seen])

            # While preserving order add auxiliary variables, and collect
            # updates
            seen = set()
            # Intermediate variables could be auxiliary
            seen_avs = set(main_vars)
            variables = []
            for var in main_vars:
                variables.append(var)
                for annotation in getattr(var.tag, 'annotations', []):
                    if annotation not in seen:
                        seen.add(annotation)
                        new_avs = [
                            av for av in annotation.auxiliary_variables
                            if not (av in seen_avs or seen_avs.add(av))]
                        variables.extend(new_avs)
                        updates = dict_union(updates, annotation.updates)

        # If shared_variables is assigned default_update (cloned), we cannot eval()
        # it to get the real numpy array value, hence, try to trace back
        # original shared variable
        def shared_variable_filter(var):
            if is_shared_variable(var) and hasattr(var, 'default_update'):
                for annotation in var.tag.annotations:
                    if hasattr(annotation, var.name) and \
                       is_shared_variable(getattr(annotation, var.name)):
                        return getattr(annotation, var.name)
            return var
        self.variables = map(shared_variable_filter, variables)
        self.updates = updates

def inputvars(a):
    """
    Get the inputs into a theano variables

    Parameters
    ----------
        a : theano variable

    Returns
    -------
        r : list of tensor variables that are inputs
    """
    return [v for v in inputs(makeiter(a)) if isinstance(v, t.TensorVariable)]

    def _get_variables(self):
        """Collect variables, updates and auxiliary variables.

        In addition collects all :class:`.Scan` ops and recurses in the
        respective inner Theano graphs.

        """
        updates = OrderedDict()

        shared_outputs = [o for o in self.outputs if is_shared_variable(o)]
        usual_outputs = [o for o in self.outputs if not is_shared_variable(o)]
        variables = shared_outputs

        if usual_outputs:
            # Sort apply nodes topologically, get variables and remove
            # duplicates
            inputs = graph.inputs(self.outputs)
            self.sorted_apply_nodes = graph.io_toposort(inputs, usual_outputs)
            self.scans = list(unique([node.op for node in self.sorted_apply_nodes
                                     if isinstance(node.op, Scan)]))
            self.sorted_scan_nodes = [node for node in self.sorted_apply_nodes
                                      if isinstance(node.op, Scan)]
            self._scan_graphs = [ComputationGraph(scan.outputs)
                                 for scan in self.scans]

            seen = set()
            main_vars = (
                [var for var in list(chain(
                    *[apply_node.inputs for apply_node in self.sorted_apply_nodes]))
                 if not (var in seen or seen.add(var))] +
                [var for var in self.outputs if var not in seen])

            # While preserving order add auxiliary variables, and collect
            # updates
            seen = set()
            # Intermediate variables could be auxiliary
            seen_avs = set(main_vars)
            variables = []
            for var in main_vars:
                variables.append(var)
                for annotation in getattr(var.tag, 'annotations', []):
                    if annotation not in seen:
                        seen.add(annotation)
                        new_avs = [
                            av for av in annotation.auxiliary_variables
                            if not (av in seen_avs or seen_avs.add(av))]
                        variables.extend(new_avs)
                        updates = dict_union(updates, annotation.updates)

        self.variables = variables
        self.updates = updates

def predict(X_test, filename='best_model_actual_data.pkl'):
    # load the saved model
    model_file = open(filename, 'rb')
    classifier = pickle.load(model_file)
    model_file.close()
    y_pred = classifier.y_pred

    # find the input to theano graph
    inputs = graph.inputs([y_pred])
    # select only x
    inputs = [item for item in inputs if item.name == 'x']
    # compile a predictor function
    predict_model = theano.function(
        inputs=inputs,
        outputs=y_pred)

    predicted_values = predict_model(X_test.astype(numpy.float32))

    return predicted_values

 def test_inputs_deep(self):
     r1, r2, r5 = MyVariable(1), MyVariable(2), MyVariable(5)
     node = MyOp.make_node(r1, r2)
     node2 = MyOp.make_node(node.outputs[0], r5)
     i = inputs(node2.outputs)
     assert i == [r1, r2, r5], i

 def test_inputs(self):
     r1, r2 = MyVariable(1), MyVariable(2)
     node = MyOp.make_node(r1, r2)
     assert inputs(node.outputs) == [r1, r2]

def elemwise_logp(model, var):
    terms = [term for term in model.factors if var in inputs([term])]
    return add(*terms)