a birdie tells me i should probably use a different optimizer (also preliminary support for native sparse attention but I don't know if I'll use it)

vall_e/engines/__init__.py

@@ -143,6 +143,8 @@ def load_engines(training=True, **model_kwargs):
 					"update_proj_gap": 1,
 					"proj_type": "std",
 				})
+			elif cfg.hyperparameters.optimizer.lower() == "adafactor":
+				optimizer_class = ml.Adafactor
 			elif cfg.hyperparameters.optimizer.lower() == "adagrad":
 				optimizer_class = ml.Adagrad
 			elif cfg.hyperparameters.optimizer.lower() == "muon":

vall_e/models/ar_nar_v2.py

@@ -876,7 +876,7 @@ def example_usage():
 		available_tasks = ["tts-nar"]
 
 	model = AR_NAR_V2(**kwargs).to(cfg.device)
-	steps = 250 // batch_size
+	steps = 500 // batch_size
 
 	optimizer = cfg.hyperparameters.optimizer.lower() if cfg.yaml_path is not None else "prodigy"
 	scheduler = cfg.hyperparameters.scheduler.lower() if cfg.yaml_path is not None else ""

vall_e/models/arch/attention/__init__.py

@@ -1,3 +1,8 @@
+"""
+Contains the zoo of alternative attention mechanisms
+To-do: align it better with nu-modelling_llama.py's attention selection mechanism
+"""
+
 import logging
 import torch
 
@@ -36,6 +41,63 @@ try:
 except Exception as e:
 	_logger.warning(f"Error while querying for `fused_attn` support: {str(e)}")
 
+# https://github.com/lucidrains/native-sparse-attention-pytorch/
+try:
+	from native_sparse_attention_pytorch.native_sparse_attention import SparseAttention
+	from native_sparse_attention_pytorch.compress_networks import GroupedMLP
+
+	# patiently waiting for specifying attention masks both for padded sequences and non-causal ones
+	# it might not be necessary since ar+nar-len-llama-8 was able to be "repaired" from the NAR being trained with a causal mask initially
+	class NativeSparseAttention(SparseAttention):
+		def __init__(self, config, layer_idx):
+			dim = config.hidden_size
+			heads = config.num_attention_heads
+			dim_head = getattr(config, "head_dim", dim // heads)
+			kv_heads = config.num_key_value_heads
+
+			# to-do: figure out these settings best for VALL-E
+			compress_block_size = 16
+			sliding_window_size = 64 # really don't want sliding attention due to the nature of the sequence
+			selection_block_size = 16
+			num_selected_blocks = 4
+			num_compressed_mem_kv = 1
+			
+			compress_mlp = GroupedMLP(
+				dim_head = dim_head,
+				compress_block_size = compress_block_size,
+				heads = heads,
+			)
+			
+			self.config = config
+			self.layer_idx = layer_idx
+
+			super().__init__(
+				dim = dim,
+				dim_head = dim_head,
+				heads = heads,
+				kv_heads = kv_heads,
+
+				sliding_window_size = sliding_window_size,
+				compress_block_size = compress_block_size,
+				selection_block_size = selection_block_size,
+				num_selected_blocks = num_selected_blocks,
+				num_compressed_mem_kv = num_compressed_mem_kv,
+
+				norm = False, # pre/post norm is done here already
+				use_diff_topk = True,
+				use_triton_kernel = False,
+				interpolated_importance_score = False,
+				query_heads_share_selected_kv = True, # if set to True, importance score is averaged across query heads to select top-n buckets of kv per kv head - but can be set to False for each query head within a group to look at different sets of kv buckets. will be more memory and compute of course
+				compress_mlp = compress_mlp,
+				compress_mlp_expand_factor = 4.,
+				strategy_combine_mlp = None
+			)
+
+	AVAILABLE_ATTENTIONS.append("sparse")
+except Exception as e:
+	raise e
+	_logger.warning(f"Error while querying for `SparseAttention` support: {str(e)}")
+	pass
 
 is_rocm = any("AMD" in torch.cuda.get_device_properties(i).name for i in range(torch.cuda.device_count()))
 is_ampere_or_newer_gpu = any(torch.cuda.get_device_properties(i).major >= 8 for i in range(torch.cuda.device_count()))

vall_e/models/arch/llama.py

@@ -451,9 +451,13 @@ class DecoderLayer(nn.Module):
 	def __init__(self, config, layer_idx):
 		super().__init__()
 	
+		self.config = config
 		self.hidden_size = config.hidden_size
 
-		self.self_attn = Attention(config=config, layer_idx=layer_idx)
+		if config.attn_mode == "sparse":
+			self.self_attn = NativeSparseAttention(config=config, layer_idx=layer_idx)
+		else:
+			self.self_attn = Attention(config=config, layer_idx=layer_idx)
 
 		self.mlp = MLP(config)
 		self.input_layernorm = RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
@@ -481,18 +485,23 @@ class DecoderLayer(nn.Module):
 			is_causal = is_causal[0]
 
 		# Self Attention
-		hidden_states, self_attn_weights, present_key_value = self.self_attn(
-			hidden_states=hidden_states,
-			attention_mask=attention_mask,
-			is_causal=is_causal,
-			position_ids=position_ids,
-			past_key_value=past_key_value,
-			output_attentions=output_attentions,
-			use_cache=use_cache,
-			cache_position=cache_position,
-			position_embeddings=position_embeddings,
-			**kwargs,
-		)
+		if self.config.attn_mode == "sparse":
+			hidden_states = self.self_attn(
+				hidden_states
+			)
+		else:
+			hidden_states, self_attn_weights, present_key_value = self.self_attn(
+				hidden_states=hidden_states,
+				attention_mask=attention_mask,
+				is_causal=is_causal,
+				position_ids=position_ids,
+				past_key_value=past_key_value,
+				output_attentions=output_attentions,
+				use_cache=use_cache,
+				cache_position=cache_position,
+				position_embeddings=position_embeddings,
+				**kwargs,
+			)
 		hidden_states = residual + hidden_states
 
 		# Fully Connected

vall_e/utils/ml.py

@@ -18,6 +18,7 @@ Adam = torch.optim.Adam
 AdamW = torch.optim.AdamW
 SGD = torch.optim.SGD
 Adagrad = torch.optim.Adagrad
+Adafactor = torch.optim.Adafactor
 
 OneCycleLR = torch.optim.lr_scheduler.OneCycleLR
 CosineAnnealingLR = torch.optim.lr_scheduler.CosineAnnealingLR