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+# coding=utf-8
+# Copyright 2024 The Kyutai and HuggingFace Inc. teams. All rights reserved.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import math
+from typing import Optional
+
+import torch
+import torch.nn as nn
+
+from ...utils import logging
+from ..gemma.modeling_gemma import GemmaForCausalLM, GemmaForSequenceClassification, GemmaForTokenClassification
+from ..granite.modeling_granite import GraniteAttention
+from ..llama.modeling_llama import LlamaDecoderLayer, LlamaMLP, LlamaModel, LlamaPreTrainedModel, LlamaRotaryEmbedding
+from .configuration_helium import HeliumConfig
+
+
+logger = logging.get_logger(__name__)
+
+
+class HeliumRMSNorm(nn.Module):
+    def __init__(self, hidden_size, eps=1e-6):
+        super().__init__()
+        self.weight = nn.Parameter(torch.ones(hidden_size))
+        self.variance_epsilon = eps
+
+    def forward(self, hidden_states):
+        input_dtype = hidden_states.dtype
+        hidden_states = hidden_states.to(torch.float32)
+        variance = hidden_states.pow(2).mean(-1, keepdim=True)
+        hidden_states = hidden_states * torch.rsqrt(variance + self.variance_epsilon)
+        return (self.weight.to(torch.float32) * hidden_states).to(input_dtype)
+
+    def extra_repr(self):
+        return f"{tuple(self.weight.shape)}, eps={self.variance_epsilon}"
+
+
+class HeliumRotaryEmbedding(LlamaRotaryEmbedding):
+    pass
+
+
+class HeliumMLP(LlamaMLP):
+    pass
+
+
+def rotate_half(x):
+    """Rotates half the hidden dims of the input."""
+    x1 = x[..., 0::2]
+    x2 = x[..., 1::2]
+    return torch.stack((-x2, x1), dim=-1).flatten(-2)
+
+
+def apply_rotary_pos_emb(q, k, cos, sin, position_ids=None, unsqueeze_dim=1):
+    """Applies Rotary Position Embedding to the query and key tensors.
+
+    Args:
+        q (`torch.Tensor`): The query tensor.
+        k (`torch.Tensor`): The key tensor.
+        cos (`torch.Tensor`): The cosine part of the rotary embedding.
+        sin (`torch.Tensor`): The sine part of the rotary embedding.
+        position_ids (`torch.Tensor`, *optional*):
+            Deprecated and unused.
+        unsqueeze_dim (`int`, *optional*, defaults to 1):
+            The 'unsqueeze_dim' argument specifies the dimension along which to unsqueeze cos[position_ids] and
+            sin[position_ids] so that they can be properly broadcasted to the dimensions of q and k. For example, note
+            that cos[position_ids] and sin[position_ids] have the shape [batch_size, seq_len, head_dim]. Then, if q and
+            k have the shape [batch_size, heads, seq_len, head_dim], then setting unsqueeze_dim=1 makes
+            cos[position_ids] and sin[position_ids] broadcastable to the shapes of q and k. Similarly, if q and k have
+            the shape [batch_size, seq_len, heads, head_dim], then set unsqueeze_dim=2.
+    Returns:
+        `tuple(torch.Tensor)` comprising of the query and key tensors rotated using the Rotary Position Embedding.
+    """
+    cos = cos.unsqueeze(unsqueeze_dim)
+    sin = sin.unsqueeze(unsqueeze_dim)
+
+    # Interleave them instead of usual shape
+    cos = cos[..., : cos.shape[-1] // 2].repeat_interleave(2, dim=-1)
+    sin = sin[..., : sin.shape[-1] // 2].repeat_interleave(2, dim=-1)
+
+    q_embed = (q * cos) + (rotate_half(q) * sin)
+    k_embed = (k * cos) + (rotate_half(k) * sin)
+
+    return q_embed, k_embed
+
+
+class HeliumAttention(GraniteAttention):
+    def __init__(self, config: HeliumConfig, layer_idx: Optional[int] = None):
+        super().__init__(config, layer_idx)
+        self.o_proj = nn.Linear(config.hidden_size, config.hidden_size, bias=False)
+        self.scaling = 1 / math.sqrt(self.head_dim)
+
+
+class HeliumDecoderLayer(LlamaDecoderLayer):
+    def __init__(self, config: HeliumConfig, layer_idx: Optional[int] = None):
+        super().__init__(config, layer_idx)
+
+        self.mlp = HeliumMLP(config)
+        self.input_layernorm = HeliumRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.post_attention_layernorm = HeliumRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+
+
+class HeliumPreTrainedModel(LlamaPreTrainedModel):
+    pass
+
+
+class HeliumModel(HeliumPreTrainedModel, LlamaModel):
+    def __init__(self, config: HeliumConfig):
+        super().__init__(config)
+        self.layers = nn.ModuleList(
+            [HeliumDecoderLayer(config, layer_idx) for layer_idx in range(config.num_hidden_layers)]
+        )
+        self.norm = HeliumRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.rotary_emb = HeliumRotaryEmbedding(config)
+        self.gradient_checkpointing = False
+
+        # Initialize weights and apply final processing
+        self.post_init()
+
+
+class HeliumForCausalLM(GemmaForCausalLM):
+    pass
+
+
+class HeliumForSequenceClassification(GemmaForSequenceClassification):
+    pass
+
+
+class HeliumForTokenClassification(GemmaForTokenClassification):
+    pass
+
+
+__all__ = [
+    "HeliumPreTrainedModel",
+    "HeliumModel",
+    "HeliumForCausalLM",
+    "HeliumForSequenceClassification",
+    "HeliumForTokenClassification",
+]