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212 lines
7.0 KiB
212 lines
7.0 KiB
5 months ago
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"""This file exports ONNX ops for opset 17.
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Note [ONNX Operators that are added/updated in opset 17]
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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https://github.com/onnx/onnx/blob/main/docs/Changelog.md#version-17-of-the-default-onnx-operator-set
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New operators:
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BlackmanWindow
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DFT
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HammingWindow
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HannWindow
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LayerNormalization
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MelWeightMatrix
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STFT
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SequenceMap
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"""
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import functools
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from typing import Optional, Sequence
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import torch
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from torch import _C
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from torch.onnx import _type_utils, errors, symbolic_helper
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from torch.onnx._internal import _beartype, jit_utils, registration
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# EDITING THIS FILE? READ THIS FIRST!
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# see Note [Edit Symbolic Files] in README.md
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__all__ = ["layer_norm", "stft"]
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_onnx_symbolic = functools.partial(registration.onnx_symbolic, opset=17)
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@_onnx_symbolic("aten::layer_norm")
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@symbolic_helper.parse_args("v", "is", "v", "v", "f", "none")
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def layer_norm(
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g: jit_utils.GraphContext,
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input: _C.Value,
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normalized_shape: Sequence[int],
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weight: _C.Value,
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bias: _C.Value,
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eps: float,
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cudnn_enable: bool,
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):
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# normalized_shape: input shape from an expected input of size
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# axis: The first normalization dimension.
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# layer_norm normalizes on the last D dimensions,
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# where D is the size of normalized_shape
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axis = -len(normalized_shape)
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scalar_type = _type_utils.JitScalarType.from_value(
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input, _type_utils.JitScalarType.FLOAT
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)
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dtype = scalar_type.dtype()
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if symbolic_helper._is_none(weight):
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weight_value = torch.ones(normalized_shape, dtype=dtype)
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weight = g.op("Constant", value_t=weight_value)
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if symbolic_helper._is_none(bias):
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bias_value = torch.zeros(normalized_shape, dtype=dtype)
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bias = g.op("Constant", value_t=bias_value)
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return g.op(
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"LayerNormalization",
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input,
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weight,
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bias,
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epsilon_f=eps,
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axis_i=axis,
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)
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def _compute_edge_sizes(n_fft, window_size):
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"""Helper function to compute the sizes of the edges (left and right)
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of a given window centered within an FFT size."""
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left = (n_fft - window_size) // 2
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right = n_fft - left - window_size
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return left, right
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@_onnx_symbolic("aten::stft")
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@symbolic_helper.parse_args("v", "i", "i", "i", "v", "b", "b", "b")
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@_beartype.beartype
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def stft(
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g: jit_utils.GraphContext,
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input: _C.Value,
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n_fft: int,
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hop_length: Optional[int] = None,
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win_length: Optional[int] = None,
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window: Optional[_C.Value] = None,
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normalized: bool = False,
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onesided: Optional[bool] = True,
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return_complex: Optional[bool] = False,
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) -> _C.Value:
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"""Associates `torch.stft` with the `STFT` ONNX operator.
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Note that torch.stft calls _VF.stft, without centering or padding options.
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Hence, this function does not contain these two arguments.
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See torch.stft source code for more info.
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Args:
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g: Graph to write the ONNX representation into
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input: Input tensor for the transformation
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n_fft: FFT size
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hop_length: Size of the hop. Defaults to `floot(n_fft // 4)`
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win_length: Size of the analysis window. Defaults to `n_fft`
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window: Analysis window. Defaults to a window of all ones
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normalized: Whether to return a normalized STFT
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onesided: Whether to return only half (+1) of the results, given the
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symmetry of the STFT
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return_complex: Whether to return the complex value (Note: Must be
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`False` or `None`)
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Returns:
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op: Operator for torch.stft associated with STFT (ONNX)
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"""
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# Checks
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if return_complex:
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raise errors.SymbolicValueError(
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msg="STFT does not currently support complex types", value=input
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)
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# Get STFT sizes
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frame_step_value = hop_length if hop_length is not None else n_fft // 4
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frame_step_const = g.op(
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"Constant", value_t=torch.tensor(frame_step_value, dtype=torch.int64)
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)
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frame_length_const = g.op(
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"Constant", value_t=torch.tensor(n_fft, dtype=torch.int64)
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)
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# Pre-process input if needed
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signal = input
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signal_rank = symbolic_helper._get_tensor_rank(signal)
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if signal_rank == 1:
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# Add batch dimension
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signal = g.op(
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"Unsqueeze",
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signal,
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g.op("Constant", value_t=torch.tensor([0], dtype=torch.int64)),
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)
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elif signal_rank > 2:
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raise errors.SymbolicValueError(
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msg="STFT can only take inputs of 1 [signal] or 2 [batch, signal] dimensions. "
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f"Current rank of signal is {signal_rank}, please reduce it.",
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value=input,
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)
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# Get window and make sure it's the same size as `win_length` or `n_fft`
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n_win = symbolic_helper._get_tensor_dim_size(window, dim=0)
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if n_win is not None:
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win_length_default = win_length if win_length else n_fft
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assert n_win == win_length_default, (
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"Analysis window size must equal `win_length` or `n_fft`. "
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f"Please, set `win_length` or `n_fft` to match `window` size ({n_win})",
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)
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# Center window around zeros if needed (required by ONNX's STFT)
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if n_win < n_fft:
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left, right = _compute_edge_sizes(n_fft, n_win)
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left_win = g.op("Constant", value_t=torch.zeros(left))
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right_win = g.op("Constant", value_t=torch.zeros(right))
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window = g.op("Concat", left_win, window, right_win, axis_i=0)
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# Create window, if needed
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if symbolic_helper._is_none(window):
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if win_length:
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if win_length > n_fft:
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raise errors.SymbolicValueError(
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msg="The analysis window can't be longer than the size of the FFT. "
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f"Please set `win_length` ({win_length}) to `n_fft` ({n_fft}) or less.",
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value=input,
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)
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# Center window, if needed
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left, right = _compute_edge_sizes(n_fft, win_length)
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torch_window = torch.hstack(
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(torch.zeros(left), torch.ones(win_length), torch.zeros(right))
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)
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else:
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# Rectangle window
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torch_window = torch.ones(n_fft)
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assert torch_window.shape[0] == n_fft
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window = g.op("Constant", value_t=torch_window)
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window = g.op(
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"Cast", window, to_i=_type_utils.JitScalarType.from_value(signal).onnx_type()
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)
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# Run STFT
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result = g.op(
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"STFT",
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signal,
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frame_step_const,
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window,
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frame_length_const,
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onesided_i=1 if onesided is None or onesided else 0,
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)
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# Transpose to mimic torch.stft's behavior
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result = g.op("Transpose", result, perm_i=[0, 2, 1, 3])
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# Remove batch dimension, if needed
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if signal_rank == 1:
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result = g.op(
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"Squeeze",
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result,
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g.op("Constant", value_t=torch.tensor([0], dtype=torch.int64)),
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)
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# Normalize, if needed
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if normalized:
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sqrt_nfft = torch.sqrt(torch.tensor(n_fft, dtype=signal.type().dtype()))
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result = g.op("Div", result, g.op("Constant", value_t=sqrt_nfft))
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return result
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