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import torch |
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from anonymous_demo.network.sa_encoder import Encoder |
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from torch import nn |
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class LSA(nn.Module): |
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def __init__(self, bert, opt): |
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super(LSA, self).__init__() |
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self.opt = opt |
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self.encoder = Encoder(bert.config, opt) |
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self.encoder_left = Encoder(bert.config, opt) |
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self.encoder_right = Encoder(bert.config, opt) |
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self.linear_window_3h = nn.Linear(opt.embed_dim * 3, opt.embed_dim) |
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self.linear_window_2h = nn.Linear(opt.embed_dim * 2, opt.embed_dim) |
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self.eta1 = nn.Parameter(torch.tensor(self.opt.eta, dtype=torch.float)) |
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self.eta2 = nn.Parameter(torch.tensor(self.opt.eta, dtype=torch.float)) |
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def forward(self, global_context_features, spc_mask_vec, lcf_matrix, left_lcf_matrix, right_lcf_matrix): |
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masked_global_context_features = torch.mul(spc_mask_vec, global_context_features) |
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lcf_features = torch.mul(global_context_features, lcf_matrix) |
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lcf_features = self.encoder(lcf_features) |
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left_lcf_features = torch.mul(masked_global_context_features, left_lcf_matrix) |
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left_lcf_features = self.encoder_left(left_lcf_features) |
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right_lcf_features = torch.mul(masked_global_context_features, right_lcf_matrix) |
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right_lcf_features = self.encoder_right(right_lcf_features) |
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if 'lr' == self.opt.window or 'rl' == self.opt.window: |
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if self.eta1 <= 0 and self.opt.eta != -1: |
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torch.nn.init.uniform_(self.eta1) |
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print('reset eta1 to: {}'.format(self.eta1.item())) |
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if self.eta2 <= 0 and self.opt.eta != -1: |
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torch.nn.init.uniform_(self.eta2) |
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print('reset eta2 to: {}'.format(self.eta2.item())) |
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if self.opt.eta >= 0: |
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cat_features = torch.cat((lcf_features, self.eta1 * left_lcf_features, self.eta2 * right_lcf_features), |
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-1) |
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else: |
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cat_features = torch.cat((lcf_features, left_lcf_features, right_lcf_features), -1) |
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sent_out = self.linear_window_3h(cat_features) |
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elif 'l' == self.opt.window: |
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sent_out = self.linear_window_2h(torch.cat((lcf_features, self.eta1 * left_lcf_features), -1)) |
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elif 'r' == self.opt.window: |
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sent_out = self.linear_window_2h(torch.cat((lcf_features, self.eta2 * right_lcf_features), -1)) |
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else: |
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raise KeyError('Invalid parameter:', self.opt.window) |
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return sent_out |
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