# Time#

class composer.Time(value, unit)[source]#

Time represents static durations of training time in terms of a TimeUnit enum.

See the Time Guide for more details on tracking time during training.

To construct an instance of Time, you can either:

1. Use a value followed by a TimeUnit enum or string. For example,

>>> Time(5, TimeUnit.EPOCH)  # describes 5 epochs.
Time(5, TimeUnit.EPOCH)
>>> Time(30_000, "tok")  # describes 30,000 tokens.
Time(30000, TimeUnit.TOKEN)
>>> Time(0.5, "dur")  # describes 50% of the training process.
Time(0.5, TimeUnit.DURATION)

1. Use one of the helper methods. See:

Time supports addition and subtraction with other Time instances that share the same TimeUnit. For example:

>>> Time(1, TimeUnit.EPOCH) + Time(2, TimeUnit.EPOCH)
Time(3, TimeUnit.EPOCH)


Time supports multiplication. The multiplier must be either a number or have units of TimeUnit.DURATION. The multiplicand is scaled, and its units are kept.

>>> Time(2, TimeUnit.EPOCH) * 0.5
Time(1, TimeUnit.EPOCH)

>>> Time(2, TimeUnit.EPOCH) * Time(0.5, TimeUnit.DURATION)
Time(1, TimeUnit.EPOCH)


Time supports division. If the divisor is an instance of Time, then it must have the same units as the dividend, and the result has units of TimeUnit.DURATION. For example:

>>> Time(4, TimeUnit.EPOCH) / Time(2, TimeUnit.EPOCH)
Time(2.0, TimeUnit.DURATION)


If the divisor is number, then the dividend is scaled, and it keeps its units. For example:

>>> Time(4, TimeUnit.EPOCH) / 2
Time(2, TimeUnit.EPOCH)

Parameters
classmethod from_batch(batch)[source]#

Create a Time with units of TimeUnit.BATCH.

Equivalent to Time(batch, TimeUnit.BATCH).

Parameters

batch (int) – Number of batches.

Returns

TimeTime instance, in batches.

classmethod from_duration(duration)[source]#

Create a Time with units of TimeUnit.DURATION.

Equivalent to Time(duration, TimeUnit.DURATION).

Parameters

duration (float) – Duration of the training process. Should be on [0, 1) where 0 represents the beginning of the training process and 1 represents a completed training process.

Returns

TimeTime instance, in duration.

classmethod from_epoch(epoch)[source]#

Create a Time with units of TimeUnit.EPOCH.

Equivalent to Time(epoch, TimeUnit.EPOCH).

Parameters

epoch (int) – Number of epochs.

Returns

TimeTime instance, in epochs.

classmethod from_sample(sample)[source]#

Create a Time with units of TimeUnit.SAMPLE.

Equivalent to Time(sample, TimeUnit.SAMPLE).

Parameters

sample (int) – Number of samples.

Returns

TimeTime instance, in samples.

classmethod from_timestring(timestring)[source]#

Parse a time string into a Time instance.

A time string is a numerical value followed by the value of a TimeUnit enum. For example:

>>> Time.from_timestring("5ep")  # describes 5 epochs.
Time(5, TimeUnit.EPOCH)
>>> Time.from_timestring("3e4tok")  # describes 30,000 tokens.
Time(30000, TimeUnit.TOKEN)
>>> Time.from_timestring("0.5dur")  # describes 50% of the training process.
Time(0.5, TimeUnit.DURATION)

Returns

Time – An instance of Time.

classmethod from_token(token)[source]#

Create a Time with units of TimeUnit.TOKEN.

Equivalent to Time(sample, TimeUnit.TOKEN).

Parameters

token (int) – Number of tokens.

Returns

TimeTime instance, in tokens.

to_timestring()[source]#

Get the time-string representation.

For example:

>>> Time(5, TimeUnit.EPOCH).to_timestring()
'5ep'

Returns

str – The time-string representation.

property unit[source]#

The unit of the time.

property value[source]#

The value of the time, as a number.