From f3b4ef2551b3bb3cb21a604c20da5a49b478f4a3 Mon Sep 17 00:00:00 2001
From: Vladimir Mandic <mandic00@live.com>
Date: Mon, 13 Oct 2025 10:20:42 -0400
Subject: [PATCH] simplify seedvr depedencies

Signed-off-by: Vladimir Mandic <mandic00@live.com>
---
 modules/postprocess/seedvr_model.py           |   2 -
 modules/seedvr/rotary_embedding.py            | 346 ++++++++++++++++++
 .../src/common/distributed/meta_init_utils.py |   3 +-
 modules/seedvr/src/models/dit/rope.py         |   3 +-
 modules/seedvr/src/models/dit_v2/rope.py      |   2 +-
 5 files changed, 349 insertions(+), 7 deletions(-)
 create mode 100644 modules/seedvr/rotary_embedding.py

diff --git a/modules/postprocess/seedvr_model.py b/modules/postprocess/seedvr_model.py
index 84a49c22b..fddeff557 100644
--- a/modules/postprocess/seedvr_model.py
+++ b/modules/postprocess/seedvr_model.py
@@ -4,7 +4,6 @@ import numpy as np
 import torch
 from PIL import Image
 from torchvision.transforms import ToPILImage
-from installer import install
 from modules import devices
 from modules.shared import opts, log
 from modules.upscaler import Upscaler, UpscalerData
@@ -33,7 +32,6 @@ class UpscalerSeedVR(Upscaler):
     def load_model(self, path: str):
         model_name = MODELS_MAP.get(path, None)
         if (self.model is None) or (self.model_loaded != model_name):
-            install('rotary_embedding_torch')
             log.debug(f'Upscaler loading: name="{self.name}" model="{model_name}"')
             t0 = time.time()
             from modules.seedvr.src.core.model_manager import configure_runner
diff --git a/modules/seedvr/rotary_embedding.py b/modules/seedvr/rotary_embedding.py
new file mode 100644
index 000000000..021ae9e52
--- /dev/null
+++ b/modules/seedvr/rotary_embedding.py
@@ -0,0 +1,346 @@
+from __future__ import annotations
+from typing import Literal
+from math import pi
+import torch
+from torch.amp import autocast
+from torch.nn import Module
+from torch import nn, einsum, broadcast_tensors, is_tensor, Tensor
+from einops import rearrange, repeat
+
+# helper functions
+
+def exists(val):
+    return val is not None
+
+def default(val, d):
+    return val if exists(val) else d
+
+# broadcat, as tortoise-tts was using it
+
+def broadcat(tensors, dim = -1):
+    broadcasted_tensors = broadcast_tensors(*tensors)
+    return torch.cat(broadcasted_tensors, dim = dim)
+
+def slice_at_dim(t, dim_slice: slice, *, dim):
+    dim += (t.ndim if dim < 0 else 0)
+    colons = [slice(None)] * t.ndim
+    colons[dim] = dim_slice
+    return t[tuple(colons)]
+
+# rotary embedding helper functions
+
+def rotate_half(x):
+    x = rearrange(x, '... (d r) -> ... d r', r = 2)
+    x1, x2 = x.unbind(dim = -1)
+    x = torch.stack((-x2, x1), dim = -1)
+    return rearrange(x, '... d r -> ... (d r)')
+
+@autocast('cuda', enabled = False)
+def apply_rotary_emb(
+    freqs,
+    t,
+    start_index = 0,
+    scale = 1.,
+    seq_dim = -2,
+    freqs_seq_dim = None
+):
+    dtype = t.dtype
+
+    if not exists(freqs_seq_dim):
+        if freqs.ndim == 2 or t.ndim == 3:
+            freqs_seq_dim = 0
+
+    if t.ndim == 3 or exists(freqs_seq_dim):
+        seq_len = t.shape[seq_dim]
+        freqs = slice_at_dim(freqs, slice(-seq_len, None), dim = freqs_seq_dim)
+
+    rot_dim = freqs.shape[-1]
+    end_index = start_index + rot_dim
+
+    assert rot_dim <= t.shape[-1], f'feature dimension {t.shape[-1]} is not of sufficient size to rotate in all the positions {rot_dim}'
+
+    # Split t into three parts: left, middle (to be transformed), and right
+    t_left = t[..., :start_index]
+    t_middle = t[..., start_index:end_index]
+    t_right = t[..., end_index:]
+
+    # Apply rotary embeddings without modifying t in place
+    t_transformed = (t_middle * freqs.cos() * scale) + (rotate_half(t_middle) * freqs.sin() * scale)
+    out = torch.cat((t_left, t_transformed, t_right), dim=-1)
+
+    return out.type(dtype)
+
+# learned rotation helpers
+
+def apply_learned_rotations(rotations, t, start_index = 0, freq_ranges = None):
+    if exists(freq_ranges):
+        rotations = einsum('..., f -> ... f', rotations, freq_ranges)
+        rotations = rearrange(rotations, '... r f -> ... (r f)')
+
+    rotations = repeat(rotations, '... n -> ... (n r)', r = 2)
+    return apply_rotary_emb(rotations, t, start_index = start_index)
+
+# classes
+
+class RotaryEmbedding(Module):
+    def __init__(
+        self,
+        dim,
+        custom_freqs: Tensor | None = None,
+        freqs_for:  Literal['lang', 'pixel', 'constant'] = 'lang',
+        theta = 10000,
+        max_freq = 10,
+        num_freqs = 1,
+        learned_freq = False,
+        use_xpos = False,
+        xpos_scale_base = 512,
+        interpolate_factor = 1.,
+        theta_rescale_factor = 1.,
+        seq_before_head_dim = False,
+        cache_if_possible = True,
+        cache_max_seq_len = 8192
+    ):
+        super().__init__()
+        # proposed by reddit user bloc97, to rescale rotary embeddings to longer sequence length without fine-tuning
+        # has some connection to NTK literature
+        # https://www.reddit.com/r/LocalLLaMA/comments/14lz7j5/ntkaware_scaled_rope_allows_llama_models_to_have/
+
+        theta *= theta_rescale_factor ** (dim / (dim - 2))
+
+        self.freqs_for = freqs_for
+
+        if exists(custom_freqs):
+            freqs = custom_freqs
+        elif freqs_for == 'lang':
+            freqs = 1. / (theta ** (torch.arange(0, dim, 2)[:(dim // 2)].float() / dim))
+        elif freqs_for == 'pixel':
+            freqs = torch.linspace(1., max_freq / 2, dim // 2) * pi
+        elif freqs_for == 'constant':
+            freqs = torch.ones(num_freqs).float()
+
+        self.cache_if_possible = cache_if_possible
+        self.cache_max_seq_len = cache_max_seq_len
+
+        self.register_buffer('cached_freqs', torch.zeros(cache_max_seq_len, dim), persistent = False)
+        self.cached_freqs_seq_len = 0
+
+        self.freqs = nn.Parameter(freqs, requires_grad = learned_freq) # pylint: disable=possibly-used-before-assignment
+
+        self.learned_freq = learned_freq
+
+        # dummy for device
+
+        self.register_buffer('dummy', torch.tensor(0), persistent = False)
+
+        # default sequence dimension
+
+        self.seq_before_head_dim = seq_before_head_dim
+        self.default_seq_dim = -3 if seq_before_head_dim else -2
+
+        # interpolation factors
+
+        assert interpolate_factor >= 1.
+        self.interpolate_factor = interpolate_factor
+
+        # xpos
+
+        self.use_xpos = use_xpos
+
+        if not use_xpos:
+            return
+
+        scale = (torch.arange(0, dim, 2) + 0.4 * dim) / (1.4 * dim)
+        self.scale_base = xpos_scale_base
+
+        self.register_buffer('scale', scale, persistent = False)
+        self.register_buffer('cached_scales', torch.zeros(cache_max_seq_len, dim), persistent = False)
+        self.cached_scales_seq_len = 0
+
+        # add apply_rotary_emb as static method
+
+        self.apply_rotary_emb = staticmethod(apply_rotary_emb)
+
+    @property
+    def device(self):
+        return self.dummy.device
+
+    def get_seq_pos(self, seq_len, device = None, dtype = None, offset = 0):
+        device = default(device, self.device)
+        dtype = default(dtype, self.cached_freqs.dtype)
+
+        return (torch.arange(seq_len, device = device, dtype = dtype) + offset) / self.interpolate_factor
+
+    def rotate_queries_or_keys(self, t, seq_dim = None, offset = 0, scale = None):
+        seq_dim = default(seq_dim, self.default_seq_dim)
+
+        assert not self.use_xpos or exists(scale), 'you must use `.rotate_queries_and_keys` method instead and pass in both queries and keys, for length extrapolatable rotary embeddings'
+
+        device, dtype, seq_len = t.device, t.dtype, t.shape[seq_dim]
+
+        seq = self.get_seq_pos(seq_len, device = device, dtype = dtype, offset = offset)
+
+        freqs = self.forward(seq, seq_len = seq_len, offset = offset)
+
+        if seq_dim == -3:
+            freqs = rearrange(freqs, 'n d -> n 1 d')
+
+        return apply_rotary_emb(freqs, t, scale = default(scale, 1.), seq_dim = seq_dim)
+
+    def rotate_queries_with_cached_keys(self, q, k, seq_dim = None, offset = 0):
+        dtype, device, seq_dim = q.dtype, q.device, default(seq_dim, self.default_seq_dim)
+
+        q_len, k_len = q.shape[seq_dim], k.shape[seq_dim]
+        assert q_len <= k_len
+
+        q_scale = k_scale = 1.
+
+        if self.use_xpos:
+            seq = self.get_seq_pos(k_len, dtype = dtype, device = device)
+
+            q_scale = self.get_scale(seq[-q_len:]).type(dtype)
+            k_scale = self.get_scale(seq).type(dtype)
+
+        rotated_q = self.rotate_queries_or_keys(q, seq_dim = seq_dim, scale = q_scale, offset = k_len - q_len + offset)
+        rotated_k = self.rotate_queries_or_keys(k, seq_dim = seq_dim, scale = k_scale ** -1)
+
+        rotated_q = rotated_q.type(q.dtype)
+        rotated_k = rotated_k.type(k.dtype)
+
+        return rotated_q, rotated_k
+
+    def rotate_queries_and_keys(self, q, k, seq_dim = None):
+        seq_dim = default(seq_dim, self.default_seq_dim)
+
+        assert self.use_xpos
+        device, dtype, seq_len = q.device, q.dtype, q.shape[seq_dim]
+
+        seq = self.get_seq_pos(seq_len, dtype = dtype, device = device)
+
+        freqs = self.forward(seq, seq_len = seq_len)
+        scale = self.get_scale(seq, seq_len = seq_len).to(dtype)
+
+        if seq_dim == -3:
+            freqs = rearrange(freqs, 'n d -> n 1 d')
+            scale = rearrange(scale, 'n d -> n 1 d')
+
+        rotated_q = apply_rotary_emb(freqs, q, scale = scale, seq_dim = seq_dim)
+        rotated_k = apply_rotary_emb(freqs, k, scale = scale ** -1, seq_dim = seq_dim)
+
+        rotated_q = rotated_q.type(q.dtype)
+        rotated_k = rotated_k.type(k.dtype)
+
+        return rotated_q, rotated_k
+
+    def get_scale(
+        self,
+        t: Tensor,
+        seq_len: int | None = None,
+        offset = 0
+    ):
+        assert self.use_xpos
+
+        should_cache = (
+            self.cache_if_possible and
+            exists(seq_len) and
+            (offset + seq_len) <= self.cache_max_seq_len
+        )
+
+        if (
+            should_cache and \
+            exists(self.cached_scales) and \
+            (seq_len + offset) <= self.cached_scales_seq_len
+        ):
+            return self.cached_scales[offset:(offset + seq_len)]
+
+        scale = 1.
+        if self.use_xpos:
+            power = (t - len(t) // 2) / self.scale_base
+            scale = self.scale ** rearrange(power, 'n -> n 1')
+            scale = repeat(scale, 'n d -> n (d r)', r = 2)
+
+        if should_cache and offset == 0:
+            self.cached_scales[:seq_len] = scale.detach()
+            self.cached_scales_seq_len = seq_len
+
+        return scale
+
+    def get_axial_freqs(
+        self,
+        *dims,
+        offsets: (
+            tuple[int | float, ...] |
+            Tensor |
+            None
+        ) = None
+    ):
+        Colon = slice(None)
+        all_freqs = []
+
+        # handle offset
+
+        if exists(offsets):
+            if not is_tensor(offsets):
+                offsets = torch.tensor(offsets)
+
+            assert len(offsets) == len(dims)
+
+        # get frequencies for each axis
+
+        for ind, dim in enumerate(dims):
+
+            offset = 0
+            if exists(offsets):
+                offset = offsets[ind]
+
+            if self.freqs_for == 'pixel':
+                pos = torch.linspace(-1, 1, steps = dim, device = self.device)
+            else:
+                pos = torch.arange(dim, device = self.device)
+
+            pos = pos + offset
+
+            freqs = self.forward(pos, seq_len = dim)
+
+            all_axis = [None] * len(dims)
+            all_axis[ind] = Colon
+
+            new_axis_slice = (Ellipsis, *all_axis, Colon)
+            all_freqs.append(freqs[new_axis_slice])
+
+        # concat all freqs
+
+        all_freqs = broadcast_tensors(*all_freqs)
+        return torch.cat(all_freqs, dim = -1)
+
+    @autocast('cuda', enabled = False)
+    def forward(
+        self,
+        t: Tensor,
+        seq_len: int | None = None,
+        offset = 0
+    ):
+        should_cache = (
+            self.cache_if_possible and
+            not self.learned_freq and
+            exists(seq_len) and
+            self.freqs_for != 'pixel' and
+            (offset + seq_len) <= self.cache_max_seq_len
+        )
+
+        if (
+            should_cache and \
+            exists(self.cached_freqs) and \
+            (offset + seq_len) <= self.cached_freqs_seq_len
+        ):
+            return self.cached_freqs[offset:(offset + seq_len)].detach()
+
+        freqs = self.freqs
+
+        freqs = einsum('..., f -> ... f', t.type(freqs.dtype), freqs)
+        freqs = repeat(freqs, '... n -> ... (n r)', r = 2)
+
+        if should_cache and offset == 0:
+            self.cached_freqs[:seq_len] = freqs.detach()
+            self.cached_freqs_seq_len = seq_len
+
+        return freqs
diff --git a/modules/seedvr/src/common/distributed/meta_init_utils.py b/modules/seedvr/src/common/distributed/meta_init_utils.py
index 794cd0b81..9a6570646 100644
--- a/modules/seedvr/src/common/distributed/meta_init_utils.py
+++ b/modules/seedvr/src/common/distributed/meta_init_utils.py
@@ -13,9 +13,8 @@
 # // limitations under the License.
 
 import torch
-from rotary_embedding_torch import RotaryEmbedding
 from torch import nn
-from torch.distributed.fsdp._common_utils import _is_fsdp_flattened
+from ....rotary_embedding import RotaryEmbedding
 
 __all__ = ["meta_non_persistent_buffer_init_fn"]
 
diff --git a/modules/seedvr/src/models/dit/rope.py b/modules/seedvr/src/models/dit/rope.py
index 3aded8fed..35b91ea8b 100644
--- a/modules/seedvr/src/models/dit/rope.py
+++ b/modules/seedvr/src/models/dit/rope.py
@@ -16,10 +16,9 @@ from functools import lru_cache
 from typing import Tuple
 import torch
 from einops import rearrange
-from rotary_embedding_torch import RotaryEmbedding, apply_rotary_emb
 from torch import nn
-
 from ...common.cache import Cache
+from ....rotary_embedding import RotaryEmbedding
 
 
 class RotaryEmbeddingBase(nn.Module):
diff --git a/modules/seedvr/src/models/dit_v2/rope.py b/modules/seedvr/src/models/dit_v2/rope.py
index 89d851792..3d294621c 100644
--- a/modules/seedvr/src/models/dit_v2/rope.py
+++ b/modules/seedvr/src/models/dit_v2/rope.py
@@ -16,9 +16,9 @@ from functools import lru_cache
 from typing import Optional, Tuple
 import torch
 from einops import rearrange
-from rotary_embedding_torch import RotaryEmbedding, apply_rotary_emb
 from torch import nn
 from ...common.cache import Cache
+from ....rotary_embedding import RotaryEmbedding, apply_rotary_emb
 
 
 class RotaryEmbeddingBase(nn.Module):