# Copyright 2021 The AIMM Group at Shenzhen Bay Laboratory & Peking University & Huawei Technologies Co., Ltd
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# ============================================================================
"""MSA"""
import numpy as np
import mindspore.nn as nn
import mindspore.common.dtype as mstype
from mindspore import Parameter
from mindspore.common.tensor import Tensor
from mindspore.ops import operations as P
from .basic import Attention, GlobalAttention
from .mask import MaskedLayerNorm
from ..common.utils import _memory_reduce
[文档]class MSARowAttentionWithPairBias(nn.Cell):
r"""
MSA row attention. Information from pair action value is made as the bias of the matrix of MSARowAttention,
in order to update the state of MSA using pair information.
Reference:
`Jumper et al. (2021) Suppl. Alg. 7 'MSARowAttentionWithPairBias'
<https://www.nature.com/articles/s41586-021-03819-2>`_.
Args:
num_head (int): The number of the attention head.
key_dim (int): The dimension of the attention hidden layer.
gating (bool): Indicator of if the attention is gated.
msa_act_dim (int): The dimension of the msa_act.
pair_act_dim (int): The dimension of the pair_act.
batch_size (int): The batch size of parameters in MSA row attention, used in while control flow.
Default: None.
slice_num (int): The number of slices to be made to reduce memory. Default: 0.
Inputs:
- **msa_act** (Tensor) - Tensor of msa_act with shape :math:`(N_{seqs}, N_{res}, msa\_act\_dim)` .
- **msa_mask** (Tensor) - The mask for MSA row attention matrix with shape :math:`(N_{seqs}, N_{res})` .
- **pair_act** (Tensor) - Tensor of pair_act with shape :math:`(N_{res}, N_{res}, pair\_act\_dim)` .
Data type is float.
- **index** (Tensor) - The index of while loop, only used in case of while control flow. Default: "None".
- **norm_msa_mask** (Tensor) - The mask of msa_act when to do layernorm with shape :math:`(N_{seqs}, N_{res})`,
Default: "None".
- **norm_pair_mask** (Tensor) - The mask of pair_act when to do layernorm with shape :math:`(N_{res}, N_{res})`,
Default: "None".
- **res_idx** (Tensor) - The residue index used to perform ROPE with shape :math:`(N_{res})`, Default: "None".
Outputs:
Tensor, the float tensor of the msa_act of the layer with shape :math:`(N_{seqs}, N_{res}, msa\_act\_dim)` .
Supported Platforms:
``Ascend`` ``GPU``
Examples:
>>> import numpy as np
>>> from mindsponge.cell import MSARowAttentionWithPairBias
>>> from mindspore import dtype as mstype
>>> from mindspore import Tensor
>>> model = MSARowAttentionWithPairBias(num_head=4, key_dim=4, gating=True,
... msa_act_dim=64, pair_act_dim=128,
... batch_size=None)
>>> msa_act = Tensor(np.ones((4, 256, 64)), mstype.float32)
>>> msa_mask = Tensor(np.ones((4, 256)), mstype.float16)
>>> pair_act = Tensor(np.ones((256, 256, 128)), mstype.float32)
>>> index = None
>>> msa_out = model(msa_act, msa_mask, pair_act, index)
>>> print(msa_out.shape)
(4, 256, 64)
"""
def __init__(self, num_head, key_dim, gating, msa_act_dim, pair_act_dim, batch_size=None, slice_num=0):
super(MSARowAttentionWithPairBias, self).__init__()
self.num_head = num_head
self.batch_size = batch_size
self.matmul = P.MatMul(transpose_b=True)
self.attn_mod = Attention(num_head, key_dim, gating, msa_act_dim, msa_act_dim, msa_act_dim, batch_size)
self.msa_act_dim = msa_act_dim
self.pair_act_dim = pair_act_dim
self.batch_size = batch_size
self.slice_num = slice_num
self.idx = Tensor(0, mstype.int32)
self.masked_layer_norm = MaskedLayerNorm()
self._init_parameter()
def construct(self, msa_act, msa_mask, pair_act, index=None, norm_msa_mask=None, norm_pair_mask=None, res_idx=None):
'''construct'''
if self.batch_size:
query_norm_gamma = P.Gather()(self.query_norm_gammas, index, 0)
query_norm_beta = P.Gather()(self.query_norm_betas, index, 0)
feat_2d_norm_gamma = P.Gather()(self.feat_2d_norm_gammas, index, 0)
feat_2d_norm_beta = P.Gather()(self.feat_2d_norm_betas, index, 0)
feat_2d_weight = P.Gather()(self.feat_2d_weights, index, 0)
else:
query_norm_gamma = self.query_norm_gammas
query_norm_beta = self.query_norm_betas
feat_2d_norm_gamma = self.feat_2d_norm_gammas
feat_2d_norm_beta = self.feat_2d_norm_betas
feat_2d_weight = self.feat_2d_weights
q, k, _ = pair_act.shape
input_bias = 1e9 * (msa_mask - 1.0)
input_bias = P.ExpandDims()(P.ExpandDims()(input_bias, 1), 2)
msa_act = self.masked_layer_norm(msa_act, query_norm_gamma, query_norm_beta, mask=norm_msa_mask)
pair_act = self.masked_layer_norm(pair_act, feat_2d_norm_gamma, feat_2d_norm_beta, mask=norm_pair_mask)
pair_act = P.Reshape()(pair_act, (-1, pair_act.shape[-1]))
nonbatched_bias = P.Transpose()(P.Reshape()(self.matmul(pair_act, feat_2d_weight), (q, k, self.num_head)),
(2, 0, 1))
batched_inputs = (msa_act, input_bias)
if res_idx is not None:
nonbatched_inputs = (nonbatched_bias, res_idx)
else:
nonbatched_inputs = (index, nonbatched_bias)
msa_act = _memory_reduce(self._compute, batched_inputs, nonbatched_inputs, self.slice_num)
return msa_act
def _init_parameter(self):
'''init parameter'''
if self.batch_size:
self.query_norm_gammas = Parameter(Tensor(np.zeros([self.batch_size, self.msa_act_dim]), mstype.float32))
self.query_norm_betas = Parameter(Tensor(np.zeros([self.batch_size, self.msa_act_dim]), mstype.float32))
self.feat_2d_norm_gammas = Parameter(
Tensor(np.zeros([self.batch_size, self.pair_act_dim]), mstype.float32))
self.feat_2d_norm_betas = Parameter(
Tensor(np.zeros([self.batch_size, self.pair_act_dim]), mstype.float32))
self.feat_2d_weights = Parameter(
Tensor(np.zeros([self.batch_size, self.num_head, self.pair_act_dim]), mstype.float32))
else:
self.query_norm_gammas = Parameter(Tensor(np.ones([self.msa_act_dim]), mstype.float32))
self.query_norm_betas = Parameter(Tensor(np.zeros([self.msa_act_dim]), mstype.float32))
self.feat_2d_norm_gammas = Parameter(Tensor(np.ones([self.pair_act_dim]), mstype.float32))
self.feat_2d_norm_betas = Parameter(Tensor(np.zeros([self.pair_act_dim]), mstype.float32))
self.feat_2d_weights = Parameter(
Tensor(np.random.normal(scale=1 / np.sqrt(self.pair_act_dim), size=[self.num_head, self.pair_act_dim]),
mstype.float32))
def _compute(self, msa_act, mask, index, nonbatched_bias):
"""
compute.
Args:
msa_act (Tensor): Tensor of msa_act.
mask (Tensor): The mask for MSA row attention matrix.
index (Tensor): The index of while loop, only used in case of while control flow. Default: None
nonbatched_bias(Tensor): Tensor of non batched bias matrix.
Outputs:
- **msa_act** (Tensor)- Tensor, the float tensor of the msa_act of the attention layer.
"""
msa_act = self.attn_mod(msa_act, msa_act, mask, index, nonbatched_bias)
return msa_act
[文档]class MSAColumnAttention(nn.Cell):
"""
MSA column-wise gated self attention.
The column-wise attention lets the elements that belong to the same target residue exchange information.
Reference:
`Jumper et al. (2021) Suppl. Alg. 8 "MSAColumnAttention"
<https://static-content.springer.com/esm/art%3A10.1038%2Fs41586-021-03819-2/MediaObjects/41586_2021_3819_MOESM1_ESM.pdf>`_.
Args:
num_head (int): The number of the heads.
key_dim (int): The dimension of the input.
gating (bool): Indicator of if the attention is gated.
msa_act_dim (int): The dimension of the msa_act. The intermediate variable after MSA retrieving
in AlphaFold.
batch_size (int): The batch size of parameters in MSAColumnAttention, used in while control flow,
Default: "None".
slice_num (int): The number of slices to be made to reduce memory, Default: 0.
Inputs:
- **msa_act** (Tensor) - Tensor of msa_act. The intermediate variable after MSA retrieving
in AlphaFold, shape :math:`[N_{seqs}, N_{res}, C_m]` .
- **msa_mask** (Tensor) - The mask for MSAColumnAttention matrix, shape :math:`[N_{seqs}, N_{res}]`.
- **index** (Tensor) - The index of while loop, only used in case of while control flow. Default: "None".
Outputs:
Tensor, the float tensor of the msa_act of the layer, shape :math:`[N_{seqs}, N_{res}, C_m]`.
Supported Platforms:
``Ascend`` ``GPU``
Examples:
>>> import numpy as np
>>> from mindsponge.cell import MSAColumnAttention
>>> from mindspore import dtype as mstype
>>> from mindspore import Tensor
>>> model = MSAColumnAttention(num_head=8, key_dim=256, gating=True,
... msa_act_dim=256, batch_size=1, slice_num=0)
>>> msa_act = Tensor(np.ones((512, 256, 256)), mstype.float32)
>>> msa_mask = Tensor(np.ones((512, 256)), mstype.float32)
>>> index = Tensor(0, mstype.int32)
>>> attn_out = model(msa_act, msa_mask, index)
>>> print(attn_out.shape)
(512, 256, 256)
"""
def __init__(self, num_head, key_dim, gating, msa_act_dim, batch_size=None, slice_num=0):
super(MSAColumnAttention, self).__init__()
self.query_norm = P.LayerNorm(begin_norm_axis=-1, begin_params_axis=-1, epsilon=1e-5)
self.attn_mod = Attention(num_head, key_dim, gating, msa_act_dim, msa_act_dim, msa_act_dim, batch_size)
self.batch_size = batch_size
self.slice_num = slice_num
self.msa_act_dim = msa_act_dim
self.idx = Tensor(0, mstype.int32)
self._init_parameter()
def construct(self, msa_act, msa_mask, index=None):
'''construct'''
if self.batch_size:
query_norm_gamma = P.Gather()(self.query_norm_gammas, index, 0)
query_norm_beta = P.Gather()(self.query_norm_betas, index, 0)
else:
query_norm_gamma = self.query_norm_gammas
query_norm_beta = self.query_norm_betas
msa_act = P.Transpose()(msa_act, (1, 0, 2))
msa_mask = P.Transpose()(msa_mask, (1, 0))
input_mask = 1e9 * (msa_mask - 1.)
input_mask = P.ExpandDims()(P.ExpandDims()(input_mask, 1), 2)
msa_act, _, _ = self.query_norm(msa_act, query_norm_gamma, query_norm_beta)
batched_inputs = (msa_act, input_mask)
nonbatched_inputs = (index,)
msa_act = _memory_reduce(self._compute, batched_inputs, nonbatched_inputs, self.slice_num)
msa_act = P.Transpose()(msa_act, (1, 0, 2))
return msa_act
def _init_parameter(self):
if self.batch_size:
self.query_norm_gammas = Parameter(Tensor(np.zeros([self.batch_size, self.msa_act_dim]), mstype.float32))
self.query_norm_betas = Parameter(Tensor(np.zeros([self.batch_size, self.msa_act_dim]), mstype.float32))
else:
self.query_norm_gammas = Parameter(Tensor(np.ones([self.msa_act_dim]), mstype.float32))
self.query_norm_betas = Parameter(Tensor(np.zeros([self.msa_act_dim]), mstype.float32))
def _compute(self, msa_act, input_mask, index):
'''compute'''
msa_act = self.attn_mod(msa_act, msa_act, input_mask, index)
return msa_act
[文档]class MSAColumnGlobalAttention(nn.Cell):
r"""
MSA column global attention. Transpose MSA information at sequence axis and residue axis, then use `GlobalAttention
<https://www.mindspore.cn/mindsponge/docs/zh-CN/r1.0.0-alpha/cell/mindsponge.cell.GlobalAttention.html>` to
do Attention between input sequences without dealing with the relationship between residues in sequence.
Comparing with MSAColumnAttention, it uses GlobalAttention to deal with longer input sequence.
Reference:
`Jumper et al. (2021) Suppl. Alg. 19 'MSAColumnGlobalAttention'
<https://www.nature.com/articles/s41586-021-03819-2>`_.
Args:
num_head (int): The number of the attention heads.
gating (bool): Indicator of if the attention is gated.
msa_act_dim (int): The dimension of the msa_act.
batch_size (int): The batch size of parameters in MSAColumnGlobalAttention, used
in while control flow. Default: None.
slice_num (int): The number of slices to be made to reduce memory. Default: 0
Inputs:
- **msa_act** (Tensor) - Tensor of msa_act with shape :math:`(N_{seqs}, N_{res}, msa\_act\_dim)` .
- **msa_mask** (Tensor) - The mask for msa_act matrix with shape :math:`(N_{seqs}, N_{res})` .
- **index** (Tensor) - The index of while loop, only used in case of while control flow. Default: "None".
Outputs:
Tensor, the float tensor of the msa_act of the layer with shape :math:`(N_{seqs}, N_{res}, msa\_act\_dim)` .
Supported Platforms:
``Ascend`` ``GPU``
Examples:
>>> import numpy as np
>>> from mindsponge.cell import MSAColumnGlobalAttention
>>> from mindspore import dtype as mstype
>>> from mindspore import Tensor
>>> model = MSAColumnGlobalAttention(num_head=4, gating=True, msa_act_dim=64, batch_size=None)
>>> msa_act = Tensor(np.ones((4, 256, 64)), mstype.float32)
>>> msa_mask = Tensor(np.ones((4, 256)), mstype.float16)
>>> index = None
>>> msa_out = model(msa_act, msa_mask, index)
>>> print(msa_out.shape)
(4, 256, 64)
"""
def __init__(self, num_head, gating, msa_act_dim, batch_size=None, slice_num=0):
super(MSAColumnGlobalAttention, self).__init__()
self.attn_mod = GlobalAttention(num_head, gating, msa_act_dim, msa_act_dim, batch_size)
self.query_norm = P.LayerNorm(begin_norm_axis=-1, begin_params_axis=-1, epsilon=1e-5)
self.batch_size = batch_size
self.slice_num = slice_num
self.msa_act_dim = msa_act_dim
self.idx = Tensor(0, mstype.int32)
self._init_parameter()
def construct(self, msa_act, msa_mask, index=None):
'''construct'''
if self.batch_size:
query_norm_gamma = P.Gather()(self.query_norm_gammas, index, 0)
query_norm_beta = P.Gather()(self.query_norm_betas, index, 0)
msa_act = P.Transpose()(msa_act, (1, 0, 2))
msa_mask = P.Transpose()(msa_mask, (1, 0))
else:
query_norm_gamma = self.query_norm_gammas
query_norm_beta = self.query_norm_betas
msa_act = P.Transpose()(msa_act, (1, 0, 2))
msa_mask = P.Transpose()(msa_mask, (1, 0))
input_mask = 1e9 * (msa_mask - 1.)
input_mask = P.ExpandDims()(P.ExpandDims()(input_mask, 1), 2)
msa_act, _, _ = self.query_norm(msa_act,
query_norm_gamma,
query_norm_beta)
msa_mask = P.ExpandDims()(msa_mask, -1)
batched_inputs = (msa_act, msa_mask)
nonbatched_inputs = (index,)
msa_act = _memory_reduce(self._compute, batched_inputs, nonbatched_inputs, self.slice_num)
msa_act = P.Transpose()(msa_act, (1, 0, 2))
return msa_act
def _init_parameter(self):
'''init parameter'''
if self.batch_size:
self.query_norm_gammas = Parameter(Tensor(np.zeros((self.batch_size, self.msa_act_dim)), mstype.float32))
self.query_norm_betas = Parameter(Tensor(np.zeros((self.batch_size, self.msa_act_dim)), mstype.float32))
else:
self.query_norm_gammas = Parameter(Tensor(np.ones((self.msa_act_dim)), mstype.float32))
self.query_norm_betas = Parameter(Tensor(np.zeros((self.msa_act_dim)), mstype.float32))
def _compute(self, msa_act, msa_mask, index):
"""
compute.
Args:
msa_act (Tensor): Tensor of msa_act.
msa_mask (Tensor): The mask for msa_act matrix.
index (Tensor): The index of while loop, only used in case of while
control flow. Default: None
Outputs:
- **msa_act** (Tensor)- Tensor, the float tensor of the msa_act of the attention layer.
"""
msa_act = self.attn_mod(msa_act, msa_act, msa_mask, index)
return msa_act