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import hashlib
import json
from typing import Dict, Tuple
import coremltools as ct # type: ignore[import]
from coremltools.converters.mil.input_types import TensorType # type: ignore[import]
from coremltools.converters.mil.mil import types # type: ignore[import]
from coremltools.models.neural_network import quantization_utils # type: ignore[import]
import torch
CT_METADATA_VERSION = "com.github.apple.coremltools.version"
CT_METADATA_SOURCE = "com.github.apple.coremltools.source"
class ScalarType:
Float = 0
Double = 1
Int = 2
Long = 3
Undefined = 4
# Supported Tensor types in coremltools:
# https://github.com/apple/coremltools/blob/main/coremltools/converters/mil/frontend/torch/converter.py#L28
torch_to_mil_types = {
ScalarType.Float: types.fp32,
ScalarType.Double: types.fp64,
ScalarType.Int: types.int32,
ScalarType.Long: types.int64,
}
class CoreMLComputeUnit:
CPU = "cpuOnly"
CPUAndGPU = "cpuAndGPU"
ALL = "all"
class CoreMLQuantizationMode:
LINEAR = "linear"
LINEAR_SYMMETRIC = "linear_symmetric"
NONE = "none"
def TensorSpec(shape, dtype=ScalarType.Float):
return (shape, dtype)
def CompileSpec(
inputs,
outputs,
backend=CoreMLComputeUnit.CPU,
allow_low_precision=True,
quantization_mode=CoreMLQuantizationMode.NONE,
mlmodel_export_path=None,
):
return (
inputs,
outputs,
backend,
allow_low_precision,
quantization_mode,
mlmodel_export_path,
)
def _check_enumerated_shape(shape):
for s in shape:
if not isinstance(s, (list, tuple)):
return False
return True
def _convert_to_mil_type(shape, dtype, name: str):
mil_shape = shape
if _check_enumerated_shape(shape):
mil_shape = ct.EnumeratedShapes(shape)
ml_type = TensorType(shape=mil_shape, dtype=torch_to_mil_types[dtype])
ml_type.name = name
return ml_type
def preprocess(script_module: torch._C.ScriptObject, compile_spec: Dict[str, Tuple]):
spec = compile_spec["forward"]
(
input_specs,
output_specs,
backend,
allow_low_precision,
quantization_mode,
mlmodel_export_path,
) = spec
mil_inputs = []
inputs = []
for index, input in enumerate(input_specs):
shape, dtype = input
name = "input_" + str(index)
inputs.append([name, str(dtype), str(shape)])
ml_type = _convert_to_mil_type(shape, dtype, name)
mil_inputs.append(ml_type)
model = torch.jit.RecursiveScriptModule._construct(script_module, lambda x: None)
mlmodel = ct.convert(model, inputs=mil_inputs)
if quantization_mode != CoreMLQuantizationMode.NONE:
quant_model_spec = quantization_utils.quantize_weights(
mlmodel, nbits=8, quantization_mode=quantization_mode
)
mlmodel = ct.models.MLModel(quant_model_spec)
spec = mlmodel.get_spec()
assert len(spec.description.output) == len(output_specs) # type: ignore[attr-defined]
outputs = []
for index, output in enumerate(output_specs):
shape, dtype = output
name = spec.description.output[index].name # type: ignore[attr-defined]
outputs.append([name, str(dtype), str(shape)])
mlmodel = ct.models.model.MLModel(spec)
print(mlmodel)
if mlmodel_export_path is not None:
print(f"Saving CoreML .mlmodel file to {mlmodel_export_path}")
mlmodel.save(mlmodel_export_path)
config = {
"spec_ver": str(spec.specificationVersion), # type: ignore[attr-defined]
"backend": backend,
"allow_low_precision": str(allow_low_precision),
}
metadata = {
"coremltool_ver": mlmodel.user_defined_metadata[CT_METADATA_VERSION],
"torch_ver": mlmodel.user_defined_metadata[CT_METADATA_SOURCE],
}
coreml_compile_spec = {
"inputs": inputs,
"outputs": outputs,
"config": config,
"metadata": metadata,
}
mlmodel = spec.SerializeToString() # type: ignore[attr-defined]
return {
"model": mlmodel,
"hash": str(hashlib.sha256(mlmodel).hexdigest()),
"extra": json.dumps(coreml_compile_spec),
}
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