Class ov::pass::KeepDequantizationPrecision

class KeepDequantizationPrecision : public ov::pass::MatcherPass

KeepDequantizationPrecision matches Dequantization subgraphs and, if precision matches with specified, Convert, Multiply, Subtract and Reshape nodes might be marked with disable_fp16_compression attribute. This prevents precision loss when the original precision is lowered during ConvertPrecision execution.

Example scenario: Original Dequantization subgraph: Potential transformed subgraph after ConvertPrecision: Input (i32) Const (i32) Input (i32) Const (i32) │ │ │ │ ▼ ▼ ▼ ▼ Convert (f32) Convert (f32) Convert (f16) Convert (f16) │ │ │ │ ▼ ▼ ▼ ▼ Subtract (f32) Subtract (f16) │ │ │ Scale (f32) │ Scale (f16) │ │ │ │ ▼ ▼ ▼ ▼ Multiply (f32) Multiply (f16)

Without KeepDequantizationPrecision, ConvertPrecision transformation may convert these operations to use fp16 instead of f32, potentially leading to accuracy degradation. Marking these nodes (KeepDequantizationPrecision) preserves the original dequantization precision (f32).