258 lines
9.5 KiB
Python
258 lines
9.5 KiB
Python
import torch
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import torch.nn.functional as F
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from xautodl.xlayers import super_core
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from xautodl.xlayers import trunc_normal_
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from xautodl.xmodels.xcore import get_model
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class MetaModelV1(super_core.SuperModule):
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"""Learning to Generate Models One Step Ahead (Meta Model Design)."""
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def __init__(
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self,
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shape_container,
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layer_dim,
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time_dim,
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meta_timestamps,
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dropout: float = 0.1,
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seq_length: int = None,
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interval: float = None,
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thresh: float = None,
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):
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super(MetaModelV1, self).__init__()
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self._shape_container = shape_container
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self._num_layers = len(shape_container)
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self._numel_per_layer = []
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for ilayer in range(self._num_layers):
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self._numel_per_layer.append(shape_container[ilayer].numel())
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self._raw_meta_timestamps = meta_timestamps
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assert interval is not None
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self._interval = interval
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self._thresh = interval * seq_length if thresh is None else thresh
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self.register_parameter(
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"_super_layer_embed",
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torch.nn.Parameter(torch.Tensor(self._num_layers, layer_dim)),
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)
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self.register_parameter(
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"_super_meta_embed",
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torch.nn.Parameter(torch.Tensor(len(meta_timestamps), time_dim)),
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)
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self.register_buffer("_meta_timestamps", torch.Tensor(meta_timestamps))
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self._time_embed_dim = time_dim
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self._append_meta_embed = dict(fixed=None, learnt=None)
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self._append_meta_timestamps = dict(fixed=None, learnt=None)
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self._tscalar_embed = super_core.SuperDynamicPositionE(
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time_dim, scale=1 / interval
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)
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# build transformer
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self._trans_att = super_core.SuperQKVAttentionV2(
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qk_att_dim=time_dim,
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in_v_dim=time_dim,
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hidden_dim=time_dim,
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num_heads=4,
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proj_dim=time_dim,
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qkv_bias=True,
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attn_drop=None,
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proj_drop=dropout,
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)
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model_kwargs = dict(
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config=dict(model_type="dual_norm_mlp"),
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input_dim=layer_dim + time_dim,
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output_dim=max(self._numel_per_layer),
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hidden_dims=[(layer_dim + time_dim) * 2] * 3,
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act_cls="gelu",
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norm_cls="layer_norm_1d",
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dropout=dropout,
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)
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self._generator = get_model(**model_kwargs)
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# initialization
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trunc_normal_(
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[self._super_layer_embed, self._super_meta_embed],
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std=0.02,
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)
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def get_parameters(self, time_embed, attention, generator):
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parameters = []
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if time_embed:
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parameters.append(self._super_meta_embed)
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if attention:
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parameters.extend(list(self._trans_att.parameters()))
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if generator:
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parameters.append(self._super_layer_embed)
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parameters.extend(list(self._generator.parameters()))
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return parameters
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@property
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def meta_timestamps(self):
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with torch.no_grad():
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meta_timestamps = [self._meta_timestamps]
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for key in ("fixed", "learnt"):
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if self._append_meta_timestamps[key] is not None:
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meta_timestamps.append(self._append_meta_timestamps[key])
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return torch.cat(meta_timestamps)
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@property
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def super_meta_embed(self):
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meta_embed = [self._super_meta_embed]
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for key in ("fixed", "learnt"):
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if self._append_meta_embed[key] is not None:
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meta_embed.append(self._append_meta_embed[key])
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return torch.cat(meta_embed)
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def create_meta_embed(self):
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param = torch.Tensor(1, self._time_embed_dim)
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trunc_normal_(param, std=0.02)
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param = param.to(self._super_meta_embed.device)
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param = torch.nn.Parameter(param, True)
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return param
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def get_closest_meta_distance(self, timestamp):
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with torch.no_grad():
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distances = torch.abs(self.meta_timestamps - timestamp)
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return torch.min(distances).item()
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def replace_append_learnt(self, timestamp, meta_embed):
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self._append_meta_timestamps["learnt"] = timestamp
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self._append_meta_embed["learnt"] = meta_embed
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@property
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def meta_length(self):
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return self.meta_timestamps.numel()
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def clear_fixed(self):
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self._append_meta_timestamps["fixed"] = None
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self._append_meta_embed["fixed"] = None
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def clear_learnt(self):
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self.replace_append_learnt(None, None)
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def append_fixed(self, timestamp, meta_embed):
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with torch.no_grad():
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device = self._super_meta_embed.device
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timestamp = timestamp.detach().clone().to(device)
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meta_embed = meta_embed.detach().clone().to(device)
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if self._append_meta_timestamps["fixed"] is None:
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self._append_meta_timestamps["fixed"] = timestamp
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else:
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self._append_meta_timestamps["fixed"] = torch.cat(
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(self._append_meta_timestamps["fixed"], timestamp), dim=0
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)
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if self._append_meta_embed["fixed"] is None:
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self._append_meta_embed["fixed"] = meta_embed
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else:
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self._append_meta_embed["fixed"] = torch.cat(
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(self._append_meta_embed["fixed"], meta_embed), dim=0
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)
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def gen_time_embed(self, timestamps):
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# timestamps is a batch of timestamps
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[B] = timestamps.shape
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# batch, seq = timestamps.shape
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timestamps = timestamps.view(-1, 1)
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meta_timestamps, meta_embeds = self.meta_timestamps, self.super_meta_embed
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timestamp_v_embed = meta_embeds.unsqueeze(dim=0)
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timestamp_qk_att_embed = self._tscalar_embed(
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torch.unsqueeze(timestamps, dim=-1) - meta_timestamps
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)
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# create the mask
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mask = (
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torch.unsqueeze(timestamps, dim=-1) <= meta_timestamps.view(1, 1, -1)
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) | (
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torch.abs(
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torch.unsqueeze(timestamps, dim=-1) - meta_timestamps.view(1, 1, -1)
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)
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> self._thresh
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)
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timestamp_embeds = self._trans_att(
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timestamp_qk_att_embed,
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timestamp_v_embed,
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mask,
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)
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return timestamp_embeds[:, -1, :]
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def gen_model(self, time_embeds):
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B, _ = time_embeds.shape
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# create joint embed
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num_layer, _ = self._super_layer_embed.shape
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# The shape of `joint_embed` is batch * num-layers * input-dim
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joint_embeds = torch.cat(
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(
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time_embeds.view(B, 1, -1).expand(-1, num_layer, -1),
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self._super_layer_embed.view(1, num_layer, -1).expand(B, -1, -1),
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),
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dim=-1,
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)
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batch_weights = self._generator(joint_embeds)
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batch_containers = []
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for weights in torch.split(batch_weights, 1):
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batch_containers.append(
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self._shape_container.translate(torch.split(weights.squeeze(0), 1))
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)
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return batch_containers
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def forward_raw(self, timestamps, time_embeds, tembed_only=False):
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raise NotImplementedError
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def forward_candidate(self, input):
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raise NotImplementedError
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def easy_adapt(self, timestamp, time_embed):
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with torch.no_grad():
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timestamp = torch.Tensor([timestamp]).to(self._meta_timestamps.device)
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self.replace_append_learnt(None, None)
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self.append_fixed(timestamp, time_embed)
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def adapt(self, base_model, criterion, timestamp, x, y, lr, epochs, init_info):
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distance = self.get_closest_meta_distance(timestamp)
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if distance + self._interval * 1e-2 <= self._interval:
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return False, None
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x, y = x.to(self._meta_timestamps.device), y.to(self._meta_timestamps.device)
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with torch.set_grad_enabled(True):
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new_param = self.create_meta_embed()
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optimizer = torch.optim.Adam(
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[new_param], lr=lr, weight_decay=1e-5, amsgrad=True
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)
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timestamp = torch.Tensor([timestamp]).to(new_param.device)
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self.replace_append_learnt(timestamp, new_param)
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self.train()
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base_model.train()
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if init_info is not None:
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best_loss = init_info["loss"]
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new_param.data.copy_(init_info["param"].data)
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else:
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best_loss = 1e9
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with torch.no_grad():
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best_new_param = new_param.detach().clone()
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for iepoch in range(epochs):
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optimizer.zero_grad()
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time_embed = self.gen_time_embed(timestamp.view(1))
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match_loss = F.l1_loss(new_param, time_embed)
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[container] = self.gen_model(new_param.view(1, -1))
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y_hat = base_model.forward_with_container(x, container)
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meta_loss = criterion(y_hat, y)
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loss = meta_loss + match_loss
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loss.backward()
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optimizer.step()
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if meta_loss.item() < best_loss:
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with torch.no_grad():
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best_loss = meta_loss.item()
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best_new_param = new_param.detach().clone()
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self.easy_adapt(timestamp, best_new_param)
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return True, best_loss
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def extra_repr(self) -> str:
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return "(_super_layer_embed): {:}, (_super_meta_embed): {:}, (_meta_timestamps): {:}".format(
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list(self._super_layer_embed.shape),
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list(self._super_meta_embed.shape),
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list(self._meta_timestamps.shape),
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)
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