# -*- coding: utf-8 -*-
from ctypes import *
import numpy as np
from .base import _Ctensor, _lib, _LiteCObjBase
from .struct import LiteDataType, LiteDeviceType, LiteIOType, Structure
MAX_DIM = 7
_lite_type_to_nptypes = {
LiteDataType.LITE_INT: np.int32,
LiteDataType.LITE_FLOAT: np.float32,
LiteDataType.LITE_UINT8: np.uint8,
LiteDataType.LITE_INT8: np.int8,
LiteDataType.LITE_INT16: np.int16,
LiteDataType.LITE_UINT16: np.uint16,
LiteDataType.LITE_HALF: np.float16,
}
_nptype_to_lite_type = {val: key for key, val in _lite_type_to_nptypes.items()}
_str_nptypes_to_lite_nptypes = {
np.dtype("int32"): LiteDataType.LITE_INT,
np.dtype("float32"): LiteDataType.LITE_FLOAT,
np.dtype("uint8"): LiteDataType.LITE_UINT8,
np.dtype("int8"): LiteDataType.LITE_INT8,
np.dtype("int16"): LiteDataType.LITE_INT16,
np.dtype("uint16"): LiteDataType.LITE_UINT16,
np.dtype("float16"): LiteDataType.LITE_HALF,
}
ctype_to_lite_dtypes = {
c_int: LiteDataType.LITE_INT,
c_uint: LiteDataType.LITE_INT,
c_float: LiteDataType.LITE_FLOAT,
c_ubyte: LiteDataType.LITE_UINT8,
c_byte: LiteDataType.LITE_INT8,
c_short: LiteDataType.LITE_INT16,
c_ushort: LiteDataType.LITE_UINT16,
}
_lite_dtypes_to_ctype = {
LiteDataType.LITE_INT: c_int,
LiteDataType.LITE_FLOAT: c_float,
LiteDataType.LITE_UINT8: c_ubyte,
LiteDataType.LITE_INT8: c_byte,
LiteDataType.LITE_INT16: c_short,
LiteDataType.LITE_UINT16: c_ushort,
}
[文档]class LiteLayout(Structure):
"""
Description of layout using in Lite. A Lite layout will be totally defined
by shape and data type.
Args:
shape: the shape of data.
dtype: data type.
Note:
Dims of shape should be less than 8. The supported data type defines at
LiteDataType
Examples:
.. code-block:: python
import numpy as np
layout = LiteLayout([1, 4, 8, 8], LiteDataType.LITE_FLOAT)
assert(layout.shape()) == [1, 4, 8, 8]
assert(layout.dtype()) == LiteDataType.LITE_FLOAT
"""
_fields_ = [
("_shapes", c_size_t * MAX_DIM),
("ndim", c_size_t),
("data_type", c_int),
]
def __init__(self, shape=None, dtype=None):
if shape:
shape = list(shape)
assert len(shape) <= MAX_DIM, "Layout max dim is 7."
self._shapes = (c_size_t * MAX_DIM)(*shape)
self.ndim = len(shape)
else:
self._shapes = (c_size_t * MAX_DIM)()
self.ndim = 0
if not dtype:
self.data_type = LiteDataType.LITE_FLOAT
elif isinstance(dtype, LiteDataType):
self.data_type = dtype
elif type(dtype) == str:
self.data_type = _str_nptypes_to_lite_nptypes[np.dtype(dtype)]
elif isinstance(dtype, np.dtype):
ctype = np.ctypeslib.as_ctypes_type(dtype)
self.data_type = ctype_to_lite_dtypes[ctype]
elif isinstance(dtype, type):
self.data_type = _nptype_to_lite_type[dtype]
else:
raise RuntimeError("unkonw data type")
@property
def dtype(self):
return _lite_type_to_nptypes[LiteDataType(self.data_type)]
@property
def shapes(self):
return list(self._shapes)[0 : self.ndim]
@shapes.setter
def shapes(self, shape):
shape = list(shape)
assert len(shape) <= MAX_DIM, "Layout max dim is 7."
self._shapes = (c_size_t * MAX_DIM)(*shape)
self.ndim = len(shape)
def __repr__(self):
data = {
"shapes": self.shapes,
"ndim": self.ndim,
"data_type": _lite_type_to_nptypes[LiteDataType(self.data_type)],
}
return data.__repr__()
class _LiteTensorDesc(Structure):
"""
warpper of the MegEngine Tensor
Args:
is_pinned_host: when set, the storage memory of the tensor is pinned
memory. This is used to Optimize the H2D or D2H memory copy, if the
device or layout is not set, when copy form other device(CUDA)
tensor, this tensor will be automatically set to pinned tensor
layout(LiteLayout): layout of this tensor
device_type: type of device
device_id: id of device
"""
_fields_ = [
("is_pinned_host", c_int),
("layout", LiteLayout),
("device_type", c_int),
("device_id", c_int),
]
def __init__(self):
self.layout = LiteLayout()
self.device_type = LiteDeviceType.LITE_CPU
self.is_pinned_host = False
self.device_id = 0
def __repr__(self):
data = {
"is_pinned_host": self.is_pinned_host,
"layout": LiteLayout(self.layout),
"device_type": LiteDeviceType(self.device_type.value),
"device_id": self.device_id,
}
return data.__repr__()
class _TensorAPI(_LiteCObjBase):
"""
Get the API from the lib
"""
_api_ = [
("LITE_make_tensor", [_LiteTensorDesc, POINTER(_Ctensor)]),
("LITE_set_tensor_layout", [_Ctensor, LiteLayout]),
("LITE_reset_tensor_memory", [_Ctensor, c_void_p, c_size_t]),
("LITE_reset_tensor", [_Ctensor, LiteLayout, c_void_p]),
("LITE_tensor_reshape", [_Ctensor, POINTER(c_int), c_int]),
(
"LITE_tensor_slice",
[
_Ctensor,
POINTER(c_size_t),
POINTER(c_size_t),
POINTER(c_size_t),
c_size_t,
POINTER(_Ctensor),
],
),
(
"LITE_tensor_concat",
[POINTER(_Ctensor), c_int, c_int, c_int, c_int, POINTER(_Ctensor),],
),
("LITE_tensor_fill_zero", [_Ctensor]),
("LITE_tensor_copy", [_Ctensor, _Ctensor]),
("LITE_tensor_share_memory_with", [_Ctensor, _Ctensor]),
("LITE_get_tensor_memory", [_Ctensor, POINTER(c_void_p)]),
("LITE_get_tensor_total_size_in_byte", [_Ctensor, POINTER(c_size_t)]),
("LITE_get_tensor_layout", [_Ctensor, POINTER(LiteLayout)]),
("LITE_get_tensor_device_type", [_Ctensor, POINTER(c_int)]),
("LITE_get_tensor_device_id", [_Ctensor, POINTER(c_int)]),
("LITE_destroy_tensor", [_Ctensor]),
("LITE_is_pinned_host", [_Ctensor, POINTER(c_int)]),
]
[文档]class LiteTensor(object):
"""
Description of a block of data with neccessary information.
Args:
layout: layout of Tensor
device_type: device type of Tensor
device_id: device id of Tensor
is_pinned_host: when set, the storage memory of the tensor is pinned
memory. This is used to Optimize the H2D or D2H memory copy, if the
device or layout is not set, when copy form other device(CUDA)
tensor, this tensor will be automatically set to pinned tensor
shapes: the shape of data
dtype: data type
Note:
Dims of shape should be less than 8. The supported data type defines at
LiteDataType
"""
_api = _TensorAPI()._lib
def __init__(
self,
layout=None,
device_type=LiteDeviceType.LITE_CPU,
device_id=0,
is_pinned_host=False,
shapes=None,
dtype=None,
physic_construct=True,
):
self._tensor = _Ctensor()
self._layout = LiteLayout()
if layout is not None:
self._layout = layout
elif shapes is not None:
shapes = list(shapes)
self._layout = LiteLayout(shapes, dtype)
self._device_type = device_type
self._device_id = device_id
self._is_pinned_host = is_pinned_host
tensor_desc = _LiteTensorDesc()
tensor_desc.layout = self._layout
tensor_desc.device_type = device_type
tensor_desc.device_id = device_id
tensor_desc.is_pinned_host = is_pinned_host
if physic_construct:
self._api.LITE_make_tensor(tensor_desc, byref(self._tensor))
self.update()
def __del__(self):
self._api.LITE_destroy_tensor(self._tensor)
[文档] def fill_zero(self):
"""
fill the buffer memory with zero
"""
self._api.LITE_tensor_fill_zero(self._tensor)
self.update()
[文档] def share_memory_with(self, src_tensor):
"""
share the same memory with the ``src_tensor``, the self memory will be
freed
Args:
src_tensor: the source tensor that will share memory with this tensor
"""
assert isinstance(src_tensor, LiteTensor)
self._api.LITE_tensor_share_memory_with(self._tensor, src_tensor._tensor)
self.update()
@property
def layout(self):
self._api.LITE_get_tensor_layout(self._tensor, byref(self._layout))
return self._layout
@layout.setter
def layout(self, layout):
if isinstance(layout, LiteLayout):
self._layout = layout
elif isinstance(layout, list):
self._layout.shapes = layout
self._api.LITE_set_tensor_layout(self._tensor, self._layout)
@property
def is_pinned_host(self):
"""
whether the tensor is pinned tensor
"""
pinned = c_int()
self._api.LITE_is_pinned_host(self._tensor, byref(pinned))
self._is_pinned_host = pinned
return bool(self._is_pinned_host)
@property
def device_type(self):
"""
get device type of the tensor
"""
device_type = c_int()
self._api.LITE_get_tensor_device_type(self._tensor, byref(device_type))
self._device_type = device_type
return LiteDeviceType(device_type.value)
@property
def device_id(self):
"""
get device id of the tensor
"""
device_id = c_int()
self._api.LITE_get_tensor_device_id(self._tensor, byref(device_id))
self._device_id = device_id.value
return device_id.value
@property
def is_continue(self):
"""
whether the tensor memory is continue
"""
is_continue = c_int()
self._api.LITE_is_memory_continue(self._tensor, byref(is_continue))
return bool(is_continue.value)
@property
def nbytes(self):
"""
get the length of the meomry in byte
"""
length = c_size_t()
self._api.LITE_get_tensor_total_size_in_byte(self._tensor, byref(length))
return length.value
[文档] def update(self):
"""
update the member from C, this will auto used after slice, share
"""
pinned = c_int()
self._api.LITE_is_pinned_host(self._tensor, byref(pinned))
self._is_pinned_host = pinned
device_type = c_int()
self._api.LITE_get_tensor_device_type(self._tensor, byref(device_type))
self._device_type = device_type
self._api.LITE_get_tensor_layout(self._tensor, byref(self._layout))
c_types = _lite_dtypes_to_ctype[self._layout.data_type]
self.np_array_type = np.ctypeslib._ctype_ndarray(
c_types, list(self._layout.shapes)[0 : self._layout.ndim]
)
[文档] def copy_from(self, src_tensor):
"""
copy memory form the src_tensor
Args:
src_tensor: source tensor
"""
assert isinstance(src_tensor, LiteTensor)
self._api.LITE_tensor_copy(self._tensor, src_tensor._tensor)
self.update()
[文档] def reshape(self, shape):
"""
reshape the tensor with data not change.
Args:
shape: target shape
"""
shape = list(shape)
length = len(shape)
c_shape = (c_int * length)(*shape)
self._api.LITE_tensor_reshape(self._tensor, c_shape, length)
self.update()
[文档] def slice(self, start, end, step=None):
"""
slice the tensor with gaven start, end, step
Args:
start: silce begin index of each dim
end: silce end index of each dim
step: silce step of each dim
"""
start = list(start)
end = list(end)
length = len(start)
assert length == len(end), "slice with different length of start and end."
if step:
assert length == len(step), "slice with different length of start and step."
step = list(step)
else:
step = [1 for i in range(length)]
c_start = (c_size_t * length)(*start)
c_end = (c_size_t * length)(*end)
c_step = (c_size_t * length)(*step)
slice_tensor = LiteTensor(physic_construct=False)
self._api.LITE_tensor_slice(
self._tensor, c_start, c_end, c_step, length, byref(slice_tensor._tensor),
)
slice_tensor.update()
return slice_tensor
[文档] def get_ctypes_memory(self):
"""
get the memory of the tensor, return c_void_p of the tensor memory
"""
mem = c_void_p()
self._api.LITE_get_tensor_memory(self._tensor, byref(mem))
return mem
[文档] def set_data_by_share(self, data, length=0, layout=None):
"""
share the data to the tensor
Args:
data: the data will shared to the tensor, it should be a
numpy.ndarray or ctypes data
"""
if isinstance(data, np.ndarray):
assert data.flags[
"C_CONTIGUOUS"
], "input numpy is not continuous, please call input = np.ascontiguousarray(input) before call set_data_by_share"
assert (
self.is_continue
), "set_data_by_share can only apply in continue tensor."
assert (
self.is_pinned_host or self.device_type == LiteDeviceType.LITE_CPU
), "set_data_by_share can only apply in cpu tensor or pinned tensor."
c_type = _lite_dtypes_to_ctype[LiteDataType(self._layout.data_type)]
if self.nbytes != data.nbytes:
self.layout = LiteLayout(data.shape, ctype_to_lite_dtypes[c_type])
self._shared_data = data
data = data.ctypes.data_as(POINTER(c_type))
if layout is not None:
self.layout = layout
else:
assert length == 0 or length == self.nbytes, "the data length is not match."
self._api.LITE_reset_tensor_memory(self._tensor, data, self.nbytes)
[文档] def set_data_by_copy(self, data, data_length=0, layout=None):
"""
copy the data to the tensor
Args:
data: the data to copy to tensor, it should be list, numpy.ndarraya
or ctypes with length
data_length: length of data in bytes
layout: layout of data
"""
if layout is not None:
self.layout = layout
assert self.is_continue, "set_data_by_copy can only apply in continue tensor."
c_type = _lite_dtypes_to_ctype[LiteDataType(self._layout.data_type)]
cpu_tensor = LiteTensor(self._layout)
tensor_length = self.nbytes
if type(data) == list:
length = len(data)
assert (
length * sizeof(c_type) <= tensor_length
), "the length of input data to set to the tensor is too large."
cdata = (c_type * length)(*data)
self._api.LITE_reset_tensor_memory(cpu_tensor._tensor, cdata, tensor_length)
self.copy_from(cpu_tensor)
elif type(data) == np.ndarray:
assert data.flags[
"C_CONTIGUOUS"
], "input numpy is not continuous, please call input = np.ascontiguousarray(input) before call set_data_by_copy"
self.layout = LiteLayout(data.shape, data.dtype)
cpu_tensor.layout = LiteLayout(data.shape, data.dtype)
cdata = data.ctypes.data_as(POINTER(c_type))
self._api.LITE_reset_tensor_memory(cpu_tensor._tensor, cdata, self.nbytes)
self.copy_from(cpu_tensor)
else:
assert (
data_length == self.nbytes or layout is not None
), "when input data is ctypes, the length of input data or layout must set"
self._api.LITE_reset_tensor_memory(cpu_tensor._tensor, data, tensor_length)
self.copy_from(cpu_tensor)
[文档] def get_data_by_share(self):
"""
get the data in the tensor, add share the data with a new numpy, and
return the numpy arrray
Note:
Be careful, the data in numpy is valid before the tensor memory is
write again, such as LiteNetwok forward next time.
"""
self.update()
buffer = c_void_p()
self._api.LITE_get_tensor_memory(self._tensor, byref(buffer))
buffer = self.np_array_type.from_address(buffer.value)
return np.ctypeslib.as_array(buffer)
[文档] def to_numpy(self):
"""
get the buffer of the tensor
"""
self.update()
if self.nbytes <= 0:
np_type = _lite_type_to_nptypes[LiteDataType(self._layout.data_type)]
return np.array([], dtype=np_type)
if self.is_continue and (
self.is_pinned_host or self.device_type == LiteDeviceType.LITE_CPU
):
ptr = c_void_p()
self._api.LITE_get_tensor_memory(self._tensor, byref(ptr))
np_type = _lite_type_to_nptypes[LiteDataType(self._layout.data_type)]
shape = [self._layout.shapes[i] for i in range(self._layout.ndim)]
np_arr = np.zeros(shape, np_type)
if np_arr.nbytes:
memmove(np_arr.ctypes.data_as(c_void_p), ptr, np_arr.nbytes)
return np_arr
else:
tmp_tensor = LiteTensor(self.layout)
tmp_tensor.copy_from(self)
return tmp_tensor.to_numpy()
def __repr__(self):
self.update()
data = {
"layout": self._layout,
"device_type": LiteDeviceType(self._device_type.value),
"device_id": int(self.device_id),
"is_pinned_host": bool(self._is_pinned_host),
}
return data.__repr__()
def LiteTensorConcat(
tensors, dim, device_type=LiteDeviceType.LITE_DEVICE_DEFAULT, device_id=-1
):
"""
concat tensors at expected dim to one tensor
Args:
dim : the dim to act concat
device_type: the result tensor device type
device_id: the result tensor device id
"""
api = _TensorAPI()._lib
length = len(tensors)
c_tensors = [t._tensor for t in tensors]
c_tensors = (_Ctensor * length)(*c_tensors)
result_tensor = LiteTensor(physic_construct=False)
api.LITE_tensor_concat(
cast(byref(c_tensors), POINTER(c_void_p)),
length,
dim,
device_type,
device_id,
byref(result_tensor._tensor),
)
result_tensor.update()
return result_tensor
def lite_dtype_2_numpy(dtype):
"""
convert lite dtype to corresponding numpy dtype
Args:
dtype(LiteDataType): source dtype
"""
assert isinstance(
dtype, LiteDataType
), "input must be LiteDataType when using lite_dtype_2_numpy."
return _lite_type_to_nptypes[dtype]