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Original file line number | Diff line number | Diff line change |
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""" | ||
Base API for importing pretrained video models | ||
""" | ||
from __future__ import annotations | ||
import torch | ||
import torch.nn as nn | ||
import torch.nn.functional | ||
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import src.mineclip_lib.utils as U | ||
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__all__ = ["VideoRewardBase"] | ||
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# calculated from 21K video clips, which contains 2.8M frames | ||
MC_IMAGE_MEAN = (0.3331, 0.3245, 0.3051) | ||
MC_IMAGE_STD = (0.2439, 0.2493, 0.2873) | ||
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||
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class VideoRewardBase(nn.Module): | ||
def __init__( | ||
self, | ||
*, | ||
image_encoder: nn.Module, | ||
temporal_encoder: nn.Module, | ||
reward_head: nn.Module, | ||
): | ||
""" | ||
Args: | ||
image_encoder: [B, C, H, W] -> [B, F] | ||
temporal_encoder: [B, L, F] -> [B, F] | ||
reward_head: [B, F] -> [B, D] softmax over D classes/dims | ||
""" | ||
super().__init__() | ||
self.image_encoder = image_encoder | ||
self.temporal_encoder = temporal_encoder | ||
self.reward_head = reward_head | ||
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||
def forward_image_features(self, frames): | ||
""" | ||
[..., C, H, W] -> [..., F], independent encoding of each frame image | ||
""" | ||
assert frames.ndim >= 4 | ||
leading_dims = frames.size()[:-3] | ||
C, H, W = frames.size()[-3:] | ||
frames = frames.view(-1, C, H, W) | ||
frames = U.basic_image_tensor_preprocess( | ||
frames, mean=MC_IMAGE_MEAN, std=MC_IMAGE_STD | ||
) | ||
features = self.image_encoder(frames) | ||
return features.view(*leading_dims, features.size(-1)) | ||
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||
def forward_video_features(self, image_features): | ||
""" | ||
[B, L, F] -> [B, F] | ||
""" | ||
B, L, F = image_features.size() | ||
video_feats = self.temporal_encoder(image_features) | ||
assert video_feats.shape[0] == B | ||
return video_feats | ||
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||
def forward_reward_head(self, video_features, text_tokens=None, softmax=False): | ||
""" | ||
[B, F] -> [B, D] | ||
""" | ||
B, F = video_features.size() | ||
if text_tokens is not None: | ||
rewards = self.reward_head(video_features, text_tokens) | ||
else: | ||
rewards = self.reward_head(video_features) | ||
if torch.is_tensor(rewards): | ||
assert rewards.shape[0] == B | ||
if softmax: | ||
rewards = torch.nn.functional.softmax(rewards, dim=1) | ||
return rewards | ||
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||
def forward(self, videos, text_tokens=None, is_video_features=False): | ||
""" | ||
Args: | ||
videos: [B, F] if is_video_features else [B, L, C, H, W] | ||
is_video_features: pass in [B, F] of already-computed video features | ||
text_tokens: [B, L, D] | ||
""" | ||
if is_video_features: | ||
assert videos.ndim == 2 | ||
return self.forward_reward_head(videos, text_tokens=text_tokens) | ||
else: | ||
assert videos.ndim == 5, "video must be 5D (raw pixels)" | ||
return self.forward_reward_head( | ||
self.forward_video_features(self.forward_image_features(videos)), | ||
text_tokens=text_tokens, | ||
) | ||
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def load_ckpt(self, ckpt_or_path, strip_prefix="model.", strict=False): | ||
if isinstance(ckpt_or_path, dict): | ||
ckpt = ckpt_or_path | ||
else: | ||
ckpt_path = U.f_expand(ckpt_or_path) | ||
assert U.f_exists(ckpt_path), f"ckpt not found: {ckpt_path}" | ||
ckpt = U.torch_load(ckpt_path) | ||
# `ret` might contain key matching info if strict=False | ||
ret = U.load_state_dict( | ||
self, ckpt["state_dict"], strip_prefix=strip_prefix, strict=strict | ||
) | ||
return ret |
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