DeepSeek RotaryEmbedding._set_cos_sin_cache: t

Read the equation

In DeepseekV3RotaryEmbedding._set_cos_sin_cache, this statement defines or updates t. This is part of the positional-phase calculation. Frequency, position, sine/cosine and coordinate ordering must agree with the source rotary convention.

Terms & definitions

The recovered passage does not supply a separate symbol table. Read the source context for the notation used in this version; familiar letters may carry different meanings in other builds.

How it works

1. Read t as the quantity being defined or updated by this relation.

2. Substitute the source-defined variables or recorded values and follow the displayed arithmetic and indexing exactly.

3. Use this version’s variable definitions and update order. The same symbol may be assigned a different meaning in another build.

Assumptions & limits

Source recovery establishes that the expression appears in this record. Its mathematical validity, implementation behavior, and interpretation must be assessed separately. See the linked source and research notes for the checks available for this version.

Original context

def _set_cos_sin_cache(self, seq_len, device, dtype):
        self.max_seq_len_cached = seq_len
        t = torch.arange(self.max_seq_len_cached,
                         device=device,
                         dtype=self.inv_freq.dtype)

        freqs = torch.outer(t, self.inv_freq.to(t.device))
        # Different from paper, but it uses a different permutation in order to obtain the same calculation

t = torch.arange(self.max_seq_len_cached,
                         device=device,
                         dtype=self.inv_freq.dtype)

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