try:
# pydot-ng is a fork of pydot that is better maintained
import pydot_ng as pydot
except ImportError:
# fall back on pydot if necessary
import pydot
if not pydot.find_graphviz():
raise RuntimeError('Failed to import pydot. You must install pydot'
' and graphviz for `pydotprint` to work.')
def model_to_dot(model, show_shapes=False, show_layer_names=True):
dot = pydot.Dot()
dot.set('rankdir', 'TB')
dot.set('concentrate', True)
dot.set_node_defaults(shape='record')
if model.__class__.__name__ == 'Sequential':
if not model.built:
model.build()
model = model.model
layers = model.layers
# first, populate the nodes of the graph
for layer in layers:
layer_id = str(id(layer))
if show_layer_names:
label = str(layer.name) + ' (' + layer.__class__.__name__ + ')'
else:
label = layer.__class__.__name__
if show_shapes:
# Build the label that will actually contain a table with the
# input/output
try:
outputlabels = str(layer.output_shape)
except:
outputlabels = 'multiple'
if hasattr(layer, 'input_shape'):
inputlabels = str(layer.input_shape)
elif hasattr(layer, 'input_shapes'):
inputlabels = ', '.join(
[str(ishape) for ishape in layer.input_shapes])
else:
inputlabels = 'multiple'
label = '%s\n|{input:|output:}|{{%s}|{%s}}' % (label, inputlabels, outputlabels)
node = pydot.Node(layer_id, label=label)
dot.add_node(node)
# second, add the edges
for layer in layers:
layer_id = str(id(layer))
for i, node in enumerate(layer.inbound_nodes):
node_key = layer.name + '_ib-' + str(i)
if node_key in model.container_nodes:
# add edges
for inbound_layer in node.inbound_layers:
inbound_layer_id = str(id(inbound_layer))
layer_id = str(id(layer))
dot.add_edge(pydot.Edge(inbound_layer_id, layer_id))
return dot
def plot(model, to_file='model.png', show_shapes=False, show_layer_names=True):
dot = model_to_dot(model, show_shapes, show_layer_names)
dot.write_png(to_file)
