def convert_reshape(self, op):
"""Convert TFLite reshape"""
try:
from tflite.BuiltinOptions import BuiltinOptions
from tflite.Operator import Operator
from tflite.ReshapeOptions import ReshapeOptions
except ImportError:
raise ImportError("The tflite package must be installed")
assert isinstance(op, Operator)
input_tensors = self.get_input_tensors(op)
assert len(input_tensors) == 2, "input tensors length should be 2"
input_tensor = input_tensors[0]
input_tensor_idx = input_tensor.tensor_idx
assert op.BuiltinOptionsType() == BuiltinOptions.ReshapeOptions
op_options = op.BuiltinOptions()
reshape_options = ReshapeOptions()
reshape_options.Init(op_options.Bytes, op_options.Pos)
target_shape = reshape_options.NewShapeAsNumpy()
input_shape_length = len(input_tensor.tensor.ShapeAsNumpy())
in_expr = self.get_expr(input_tensor_idx)
if input_shape_length in (1, 2):
# The rule is channel first (after N but before H, W).
# length of 1 means N*H*W*C, do nothing.
# length of 2 means N*H*W, C, do nothing.
pass
elif input_shape_length == 3:
# convert N C H*W to N H*W C
in_expr = _op.transpose(in_expr, axes=(0, 2, 1))
elif input_shape_length == 4:
# convert input to N H W C, then reshape to target shape,
# finally convert back if necessary
in_expr = _op.transpose(in_expr, axes=(0, 2, 3, 1))
else:
msg = 'Input shape length {} for operator Reshape is not valid.'
raise tvm.error.OpAttributeInvalid(msg.format(input_shape_length))
out = _op.reshape(in_expr, newshape=tuple(target_shape))
# The rule is channel first.
# 1: N*H*W*C
# 2: N*H*W, C
# 3: N H W C, reshape to N H*W C, transpose to N C H*W
# 4: N H W C, transpose to N C H W
# add more if we need target shapes in future
if len(target_shape) == 1 or len(target_shape) == 2:
pass
elif len(target_shape) == 3:
out = _op.transpose(out, axes=(0, 2, 1))
elif len(target_shape) == 4:
out = _op.transpose(out, axes=(0, 3, 1, 2))
else:
raise tvm.error.OpAttributeInvalid(
'Length of target shape must be between 1 and 5 for operator Reshape.'
)
return out
def convert_reshape(self, op):
"""Convert TFLite reshape"""
try:
from tflite.BuiltinOptions import BuiltinOptions
from tflite.Operator import Operator
from tflite.ReshapeOptions import ReshapeOptions
except ImportError:
raise ImportError("The tflite package must be installed")
assert isinstance(op, Operator)
input_tensors = self.get_input_tensors(op)
assert len(input_tensors) == 2, "input tensors length should be 2"
input_tensor = input_tensors[0]
input_tensor_idx = input_tensor.tensor_idx
assert op.BuiltinOptionsType() == BuiltinOptions.ReshapeOptions
op_options = op.BuiltinOptions()
reshape_options = ReshapeOptions()
reshape_options.Init(op_options.Bytes, op_options.Pos)
target_shape = reshape_options.NewShapeAsNumpy()
in_expr = self.get_expr(input_tensor_idx)
out = _op.reshape(in_expr, newshape=tuple(target_shape))
return out
def __init__(self, op, op_type, tflite_interpreter):
Layer.__init__(self, op, op_type, tflite_interpreter)
if op.BuiltinOptions() is None:
self.tflite_reshape_parser = None
else:
self.tflite_reshape_parser = ReshapeOptions()
self.tflite_reshape_parser.Init(op.BuiltinOptions().Bytes, op.BuiltinOptions().Pos)
class Reshape(Layer):
def __init__(self, op, op_type, tflite_interpreter):
Layer.__init__(self, op, op_type, tflite_interpreter)
if op.BuiltinOptions() is None:
self.tflite_reshape_parser = None
else:
self.tflite_reshape_parser = ReshapeOptions()
self.tflite_reshape_parser.Init(op.BuiltinOptions().Bytes,
op.BuiltinOptions().Pos)
def generate(self):
node_output_detail = self.tflite_interpreter._get_tensor_details(
self.op.Outputs(0))
node_input_detail = self.tflite_interpreter._get_tensor_details(
self.op.Inputs(0))
out_dim = node_output_detail['shape']
in_dim = node_input_detail['shape']
dims = list(range(len(in_dim)))
dims = dims[:1] + dims[2:] + dims[1:2]
# add transpose
transpose_before_node_name = 'transpose_node_before_reshape_' + self.node_name
transpose_before_node = onnx.helper.make_node(
'Transpose',
inputs=self.input_nodes_name,
outputs=[transpose_before_node_name],
perm=dims,
name=transpose_before_node_name)
# update tables
self.node_list.append(transpose_before_node)
reshape_node_name = self.node_name
shape_tensor_name = 'shape_tensor_' + self.node_name
shape_node_name = 'shape_const_' + self.node_name
# no attribute 'new_shape', should be op 'squeeze'
if self.tflite_reshape_parser is None:
new_shape = np.array(out_dim, dtype='int64')
elif not self.tflite_reshape_parser.NewShapeIsNone():
new_shape = np.array(self.tflite_reshape_parser.NewShapeAsNumpy(),
dtype='int64')
shape_tensor = onnx.helper.make_tensor(shape_tensor_name,
TensorProto.INT64,
new_shape.shape, new_shape)
shape_node = helper.make_node("Constant", [], [shape_node_name],
name=shape_node_name,
value=shape_tensor)
reshape_node = onnx.helper.make_node(
'Reshape',
inputs=[transpose_before_node_name, shape_node_name],
outputs=[reshape_node_name],
name=reshape_node_name)
# update tables
self.node_list.append(shape_node)
self.node_list.append(reshape_node)
# no attribute 'new_shape',
if self.tflite_reshape_parser is None:
pass
elif self.tflite_reshape_parser.NewShapeIsNone:
dims = list(range(len(out_dim)))
dims = dims[:1] + dims[-1:] + dims[1:-1]
# add transpose
transpose_after_node_name = 'transpose_node_after_reshape_' + self.node_name
transpose_after_node = onnx.helper.make_node(
'Transpose',
inputs=[reshape_node_name],
outputs=[transpose_after_node_name],
perm=dims,
name=transpose_after_node_name)
# update tables
self.node_list.append(transpose_after_node)
# change output node's input_name
for o_n in self.output_nodes:
for idx, o_n_i_n in enumerate(o_n.input_nodes_name):
if o_n_i_n == self.node_name:
o_n.input_nodes_name[idx] = transpose_after_node_name
return self.node_list, self.value_infos, self.weight_node_list