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Merged
joein merged 1 commit into from
Sep 29, 2026
Merged

new: add constella #751

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26 changes: 26 additions & 0 deletions fastembed/text/onnx_embedding.py
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,32 @@
sources=ModelSource(hf="jinaai/jina-clip-v1"),
model_file="onnx/text_model.onnx",
),
DenseModelDescription(
model="Qdrant/constella-zero",
dim=1024,
description=(
"Text embeddings, Unimodal (text), English, 512 input tokens truncation, "
"Query-side lookup table with no transformer, embeds into the document space of "
"stella_en_400M_v5, Prefixes for queries/documents: not necessary, 2026 year."
),
license="mit",
size_in_GB=0.03,
sources=ModelSource(hf="Qdrant/constella-zero"),
model_file="model.onnx",
),
DenseModelDescription(
model="Qdrant/stella-en-400M-v5-doc-onnx",
dim=1024,
description=(
"Text embeddings, Unimodal (text), English, 512 input tokens truncation, "
"Document side of stella_en_400M_v5 only -- queries need its s2p_query prompt, "
"Prefixes for queries/documents: necessary, 2026 year."
),
license="mit",
size_in_GB=1.75,
sources=ModelSource(hf="Qdrant/stella-en-400M-v5-doc-onnx"),
model_file="model.onnx",
),
DenseModelDescription(
model="minishlab/potion-base-8M",
dim=256,
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13 changes: 13 additions & 0 deletions fastembed/text/pooled_normalized_embedding.py
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Expand Up @@ -120,6 +120,19 @@
sources=ModelSource(hf="Qdrant/gte-large-onnx"),
model_file="model.onnx",
),
DenseModelDescription(
model="Qdrant/constella-nano",
dim=1024,
description=(
"Text embeddings, Unimodal (text), English, 512 input tokens truncation, "
"Query-side 34.5M-parameter transformer, embeds into the document space of "
"stella_en_400M_v5, Prefixes for queries/documents: not necessary, 2026 year."
),
license="mit",
size_in_GB=0.14,
sources=ModelSource(hf="Qdrant/constella-nano"),
model_file="model.onnx",
),
]


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9 changes: 9 additions & 0 deletions tests/test_text_onnx_embeddings.py
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Expand Up @@ -85,6 +85,15 @@
"google/siglip2-base-patch16-224": np.array(
[-0.01181389, 0.00737596, 0.01118064, 0.0103095, 0.3451049]
),
"Qdrant/constella-zero": np.array(
[-0.00065711, -0.02646863, -0.03326607, 0.01312574, -0.01599784]
),
"Qdrant/constella-nano": np.array(
[0.00829927, -0.00579543, -0.05936033, 0.02826244, -0.01873815]
),
"Qdrant/stella-en-400M-v5-doc-onnx": np.array(
[0.00934642, -0.00412083, -0.0927834, -0.00382371, -0.0415402]
),
"minishlab/potion-base-8M": np.array(
[-0.03432461, -0.08020256, -0.14396408, 0.08480079, 0.01958815]
),
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